Ignore the supports...

Do you have everything for the system you are drawing IN the service template?

For example I have all the Copper and Weldbend items to draw CHWS.

If you look back at my screenshot you will see..

Copper <=2.0  what this means is all piping 2" and Down will be copper

A53 Sch40 >2.0 and <=10.0 this means larger than 2" and upto and including 10" will be A52 Schedule 40 steel pipe

A53 Standard >10.0 this means larger than 10" will be standard A53 steel piping

This is how you set it so when you cross that threshold you change materials