How will you call from one action to another action

HP QTP allows calling an action in 2 ways

1.  Call to copy of Action - The original action is copied in its entirety, including checkpoints, parameterization, the corresponding action tab in the Data Table, any defined action parameters, local object repository. The action is inserted into the test as an independent, non-reusable action (even if the original action was reusable). After the action is copied into your test, you can add to, delete from, or modify the action just as you would with any other non-reusable action. Any changes you make to this action after you insert it affect only this action, and changes you make to the original action do not affect the copied action. To view, Right-click & select Action > Insert Call to Copy.

2.    Call to Existing an Action - In this approach, a link is created to called Action. User can view the steps of the action in the action view, but you cannot modify them. The called action’s local object repository (if it has one) is also read-only. If the called external action has data in the Data Table, however, you can choose whether you want the data from the action’s data sheet to be imported as a local, editable copy, or whether you want to use the (read- only) data from the original action. (Columns and data from the called action’s global data sheet are always imported into the calling test as a local, editable copy.) To modify a called, external action, you must open the test with which the action is stored and make your modifications there. The modifications apply to all tests that call that action. If you chose to use the original action’s data when you call an external action, then changes to the original action’s data are applied as well. To view, Right-click & select Action > Insert Call to Existing Action.