How do I assign insulation in elbow fittings in Piping extension

I am using Creo 9.0 version ,

I need to apply the Insulation on the pipe and fitting,  however after applying insulation through insulation feature it only considers the pipe segment and do not consider fitting, 

In order to create the insulation on fitting i need to do it manually which is ok for small assembly but in cases where plant is design here it becomes difficult to user  to each insulation manually 

There must be provision to where insulation feature also considers the fitting involve,