You can <<*Set the value of one !groupname! to equal the selected positional value of another groupname.
The same value selected for !petitioner! group will be assigned to the !respondent! group. So if you selected 'Appellant' from the !Petitioner! group (position 3 of 4), the !Respondent! group will likewise reflect 3 (of 4) (irrespective of the fact that the textual values of each group may be quite different, even opposites.
For further explanation, let's assume is that there are a series of potential titles/values for group 'A' that have a parallel series of correspondent titles/values for group "B'.
Let's assume the above entries in the AskTables, and the following in the body of the document:
The selection of Appellant in the Interview results in 'Appellant' and 'Appellee' remaining in the document body. (Actually, choosing Appellant for the !petitioner! group results in the assignment of "3 of 4" for the !petitioner! and the !respondent! group, but the ultimate result is 'Appellant' and 'Appellee'.)
In document body:
<<*Options*!buyer!*Grantee/Buyer/Lessee>> hereby agrees to acquire and
<<*Options*!owner!*Grantor/Seller/Lessor>>hereby agrees to convey . . .
Now, as stated above, and elsewhere, that the value of a group is simply positional. It is possible simply to assign '!petitioner! (or '!buyer!) as the name of the 'second' group (instead of creating a new group) and the same result would obtain.
If 'Appellant' (third position) is selected for the first instance of !petitioner!, the same position in any following same-named group will be automatically selected. The result is identical.
But that doesn't mean the 'Set: Equal' function has no benefit. While which !groupname! is used does not matter to Pathagoras (given that he has no innate intelligent), it probably does matter to you and your staff as you create and review (and teach) the document's setup. Reusing !groupnames! for opposites, while perfectly 'legal,' nevertheless can be quite confusing. Titling/grouping with more accurate and descriptive names will enhance understanding and teach-ability.