How can i set the ctype of a particle that is already being created as a product of a ctype? (Ex: Dray with ctype snow, but i want the ctype of the snow to be sing; same with clne, bcln, or pcln.)
It depends on the element. There's only a few where you can actually do this (like PIPE, STOR, or VIRS). It's not possible for DRAY, or most other elements, because there aren't enough properties to store recursive properties like this.