The first step is to create the master drawing.
Remember that master drawings are those dedicated to the maintenance of the library.
Launch TOP Layout and create a new drawing.
Save the drawing as PALLETTIZERS.DWG in the MASTERS folder.
Rename the TOP part as PALLETTIZERS and create two subparts: one for each palletizer model.
Insert the MATES for input and output into the palletizer figures.

Save the draing and publish it with the specific command.

now we check if the two files are created.