I have a start part that I want to be able to taper one end both ends or no ends. the paramter in put is 0 1 or 2. the taper is grouped into 2 features
Pro/Program will let you edit the feature list to include or suppress features in the model using IF statements. You can then insert IF statements to add one taper or both tapers. IF T= 0 or any other integer, then no taper will be added. One example would be similar to below (I don't have Creo open right now, so I may be slightly off on syntax, but you can check Help for Tools >Pro/Program.
IF T=2
ADD FEATURE (first taper)
....
END ADD
ADD FEATURE {2nd taper)
....
END ADD
ENDIF
IF T= 1
ADD FEATURE (first taper)
END ADD
ENDIF