I am currently trying to work running a simulation on a part but it only allows for the simulation of one body at a time. The part was created using weldment, what is the best way to combine these bodies into one so the part can be run through simulation?
I prefer to make a new parent assembly, start a new in-context part, then start that part with a "join" command.
Solid operations on that new part can complete the weld shapes and the single part can be used in a simulation study.
The part can be left linked to the source parts, or links broken to keep the designer from messing up the saved study.
I assume you are using simxpress which does not allow you to perform simulation for multibody and assembly; anyway, simply search for combine command which also can be found under direct editing tab.