I am using piping components, tees, elbows, nipples etc in an assembly and have design tables to choose the size I need.  These woek very well except for the nipples and I need a way to insert a 1" nipple 3" long at location in the assembly and another 1" nipple say 4.2" long  but when I change the length of the nipple all the other 1" nipples change to the same length.  So far I have not been able to find anything in users handbook or this forum that addresses this. Any help would be appreciated.

Thanks