Basically surgery Split is used to divide objects, while Save objects – do zapisywania.
However, you can use division and save the objects immediately. In this case, you can also create an assembly, admittedly a separate operation.
But first, when dividing, you need to save objects! You can do this by double-clicking in the cell of a given object.
To create an assembly, select the Insert menu > Operations > Create an assembly. Now you need to specify the split operation and create the assembly file. Unfortunately, the save operation will not be visible in the tree.
Therefore, during the division, if you use settings Ask about the selection template, the program will ask you to indicate the part and assembly template.