no, no, no, you don't use relative job in Motosim.
With Motosim you open a project with the original robot, load the job and move that robot to the first position, then open a second robot in the same project using the new robot. do not shift the base and OPL snap the new robot TCP to the old robot position and record the step. Move the original robot to the next step and OPL snap the second robot to it and record the step (keep doing this to record all the steps). Takes time. Takes patients.