diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 71b6041..e22b48c 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -55,6 +55,7 @@
 require_once $rootDir.'/tests/webfiori/tests/cli/TestCommand.php';
 require_once $rootDir.'/tests/webfiori/tests/cli/testCommands/Command00.php';
 require_once $rootDir.'/tests/webfiori/tests/cli/testCommands/Command01.php';
+require_once $rootDir.'/tests/webfiori/tests/cli/testCommands/Command03.php';
 require_once $rootDir.'/tests/webfiori/tests/cli/testCommands/WithExceptionCommand.php';
 require_once $rootDir.'/tests/webfiori/tests/TestStudent.php';
 require_once $rootDir.'/tests/webfiori/tests/TestStudent2.php';
diff --git a/tests/webfiori/tests/cli/RunnerTest.php b/tests/webfiori/tests/cli/RunnerTest.php
index 43139dd..27e0a75 100644
--- a/tests/webfiori/tests/cli/RunnerTest.php
+++ b/tests/webfiori/tests/cli/RunnerTest.php
@@ -542,6 +542,30 @@ public function testRunner21() {
             "Command Exit Status: -1\n"
         ], $output);
     }
+    public function testRunner22() {
+        $runner = new Runner();
+        $runner->register(new testCommands\Command03());
+        $runner->setArgsVector([
+            'entry.php',
+            'run-another',
+            'arg-1' => 'Nice',
+            'arg-2' => 'Cool'
+        ]);
+        $runner->setInputStream(new ArrayInputStream([
+
+        ]));
+        $runner->setOutputStream(new ArrayOutputStream());
+        $exitCode = $runner->start();
+        $output = $runner->getOutput();
+        $this->assertEquals([
+            "Running Sub Command\n",
+            "System version: 1.0.0\n",
+            "Nice\n",
+            "Cool\n",
+            "Ur\n",
+            "Done\n",
+        ], $output);
+    }
     /**
      * @test
      */
diff --git a/tests/webfiori/tests/cli/testCommands/Command03.php b/tests/webfiori/tests/cli/testCommands/Command03.php
new file mode 100644
index 0000000..86a9448
--- /dev/null
+++ b/tests/webfiori/tests/cli/testCommands/Command03.php
@@ -0,0 +1,19 @@
+<?php
+namespace webfiori\tests\cli\testCommands;
+
+use webfiori\cli\CLICommand;
+
+class Command03 extends CLICommand {
+    public function __construct() {
+        parent::__construct('run-another');
+    }
+
+    public function exec(): int {
+        $this->println('Running Sub Command');
+        $this->getOwner()->register(new Command01());
+        $this->execSubCommand('show-v', ['arg-3' => 'Ur']);
+        $this->println('Done');
+        return 0;
+    }
+
+}
diff --git a/webfiori/cli/CLICommand.php b/webfiori/cli/CLICommand.php
index 9dc6563..34ab7a2 100644
--- a/webfiori/cli/CLICommand.php
+++ b/webfiori/cli/CLICommand.php
@@ -306,7 +306,6 @@ public function confirm(string $confirmTxt, bool $default = null) : bool {
     public function error(string $message) {
         $this->printMsg($message, 'Error', 'light-red');
     }
-
     /**
      * Execute the command.
      * 
@@ -320,17 +319,23 @@ public function error(string $message) {
     public function excCommand() : int {
         $retVal = -1;
 
-        foreach ($this->getOwner()->getArgs() as $arg) {
-            $this->addArgument($arg);
+        $owner = $this->getOwner();
+
+        if ($owner !== null) {
+            foreach ($owner->getArgs() as $arg) {
+                $this->addArgument($arg);
+            }
         }
 
         if ($this->parseArgsHelper() && $this->checkIsArgsSetHelper()) {
             $retVal = $this->exec();
         }
 
-        foreach ($this->getOwner()->getArgs() as $arg) {
-            $this->removeArgument($arg->getName());
-            $arg->resetValue();
+        if ($owner !== null) {
+            foreach ($owner->getArgs() as $arg) {
+                $this->removeArgument($arg->getName());
+                $arg->resetValue();
+            }
         }
 
         return $retVal;
@@ -347,6 +352,33 @@ public function excCommand() : int {
      * 
      */
     public abstract function exec() : int;
+    /**
+     * Execute a registered command using a sub-runner.
+     * 
+     * This method can be used to execute a registered command within the runner 
+     * using another
+     * runner instance which shares argsv, input and output streams with the
+     * main runner. It can be used to invoke another command from within a
+     * running command.
+     * 
+     * @param string $name The name of the command. It must be a part of
+     * registered commands.
+     * 
+     * @param array $additionalArgs An associative array that represents additional arguments
+     * to be passed to the command.
+     * 
+     * @return int The method will return an integer that represent exit status
+     * code of the command after execution.
+     */
+    public function execSubCommand(string $name, $additionalArgs = []) : int {
+        $owner = $this->getOwner();
+
+        if ($owner === null) {
+            return -1;
+        }
+
+        return $owner->runCommandAsSub($name, $additionalArgs);
+    }
     /**
      * Returns an object that holds argument info if the command.
      * 
@@ -406,11 +438,13 @@ public function getArgValue(string $optionName) {
         $arg = $this->getArg($trimmedOptName);
 
         if ($arg !== null) {
-            if ($arg->getValue() !== null && !($this->getOwner() !== null && $this->getOwner()->isInteractive())) {
+            $owner = $this->getOwner();
+
+            if ($arg->getValue() !== null && !($owner !== null && $owner->isInteractive())) {
                 return $arg->getValue();
             }
 
-            return Argument::extractValue($trimmedOptName, $this->getOwner());
+            return Argument::extractValue($trimmedOptName, $owner);
         }
 
         return null;
diff --git a/webfiori/cli/Runner.php b/webfiori/cli/Runner.php
index 719b8f1..941f61d 100644
--- a/webfiori/cli/Runner.php
+++ b/webfiori/cli/Runner.php
@@ -423,6 +423,45 @@ public function runCommand(CLICommand $c = null, array $args = [], bool $ansi =
 
         return $this->commandExitVal;
     }
+    /**
+     * Execute a registered command using a sub-runner.
+     * 
+     * This method can be used to execute a registered command using another
+     * runner instance which shares argsv, input and output streams with the
+     * main runner. It can be used to invoke another command from within a
+     * running command.
+     * 
+     * @param string $commandName The name of the command. It must be a part of
+     * registered commands.
+     * 
+     * @param array $additionalArgs An associative array that represents additional arguments
+     * to be passed to the command.
+     * 
+     * @return int The method will return an integer that represent exit status
+     * code of the command after execution.
+     */
+    public function runCommandAsSub(string $commandName, array $additionalArgs = []) : int {
+        $c = $this->getCommandByName($commandName);
+
+        if ($c === null) {
+            return -1;
+        }
+        $subRunner = new Runner();
+        $subRunner->setInputStream($this->getInputStream());
+        $subRunner->setOutputStream($this->getOutputStream());
+        $subRunner->register($c);
+        $args = $this->getArgsVector();
+        $args[0] = $commandName;
+        $code = $subRunner->runCommand(null, array_merge($args, $additionalArgs), $this->isAnsi);
+
+        if ($code != 0) {
+            if ($this->getActiveCommand() !== null) {
+                $this->getActiveCommand()->warning('Command "'.$commandName.'" exited with code '.$code.'.');
+            }
+        }
+
+        return $code;
+    }
 
     /**
      * Sets the command which is currently in execution stage.