Hi leahp

Do you want to create a change every time you close an item? Have you considered a simple ui action on the catalog task form if it's discretionary?

But sticking with the workflow for now could you do a screenie of your workflow, just need to understand what objects you are using to create the various records

Assume you are doing create task for the catalog task then 1 maybe 2 run scripts that generate the other records and link them?

Pop the various scripts in too so we can see what you're doing

Regards