>In the add button click event of form abc.scx i am doing this.
>
>DO FORM 'forms\cnaddform.scx' WITH THISFORMSET
>
>Now i want to send the abc.scx form caption to the form cnaddform.scx
>
>Thank you.

Since the child form is not the current active form until its Activate fires, you could use the following in the INIT of the child form instead of passing a parameter to the INIT:

local lcCaption
lcCaption = []
IF VARTYPE("_screen.activeform") = "O"
   lcCaption = _screen.activeform.caption
ELSE
   *!* there was no calling form
ENDIF

This is also a good way to get an object reference to the parent form for use as needed while the child form is instanciated. You could store that object reference in a property of the child form. Just set that property to .NULL. in the Destroy method of the child form.