Does the Existing reusable action can be modified at the time of calling the action in QTP?

If we are calling a action as call to copy action then it can be modified, but if we r calling it as a call to existing action it can’t be modified.

Note:
* QTP records each step you perform and generates a test tree and test script.
* QTP records in normal recording mode.
* If you are creating a test on web object, you can record your test on one browser and run it on another browser.
* Analog Recording and Low Level Recording require more disk space than normal recording mode.

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