can anybody please provide guideline on this.
If the subform is not a part of the Mail template/file of the receiving user, it will not appear. In order to do this you have to build the form in the “generating database” (I assume its an app not your mail file), with the subform on it along with everything else. Then with the send operation (if Lotus Script anyway), use TRUE for the first argument:
This will embed the form, just as it is, when it sends it.