Mold Tools + Existing part

Hi Forum.

I'm new at SW and i have just started using Mold Tools in SW.

When I have created all the parting lines, Tool Splits and Cores i want to use these new parts in an Assembly together with existing parts. Maybe standard Hasco or Meusburger parts.

Lets say i have an entire Meusburger Mould Tool and I want to create/use the Core - Cavity created in Mold Tool and make the parts "as one".

Resently I have done the following in the Assembly.

Insert Part - "selected the part" - Mate it correctly so its where I want it to be - Edit one of the Standard Base Parts - Made an Extruded Base thats bigger than the "Selected Part"

- Then I select - Insert - Molds - Cavity and extracts the "Selected Part" from Extruded Base. I now have my Core.

This seems to work fine, but I don't make use of the things I have made in the Mold Tools part of SW.

What other ways is there to make a Core and Cavity on and in existing parts and componends.

SolidworksPlastics And Mold Design