Hi,
Certainly.
If you are importing say, detail cash batches, you simply define the document number as a default field with a blank string, in your defined template. (You set the default settings for the string at the bottom of the window.)

With a blank document number, the cash import will retrieve the batches as unapplied amounts that a subsequent person can assign to the proper or known document number within the customer's account.

Best,
Brian