You can combine cutlists by exporting the parts in one job & them importing them into another:
Click on the Parts Tab
Click Export Parts to XML
Name the file
Open another job in the optimizer
Click on the Parts Tab
Click Import from XML
Select the file
That will combine the parts.
I would recommend you renumber the cabinets in Mozaik before sending cabinets to the optimizer so you do not end up with multiple cabinets with the same numbers ...
To renumber cabinets,
Click Edit (on the top menu)
Click Job
Enter a new Starting Cab#
NOTE:
If you use CSV when exporting, you will get the sizes but no operations.