You can create and use as many templates as you wish in DocuGen; there is no limit, even on the free plan!
However, you can attach only one template to each DocuGen view. If you need to generate multiple types of documents from the same monday.com board, then create a separate DocuGen view for each type of document.
For example, suppose you have a board where you track customer payments. You might want to generate invoices from this board, and once customers pay, you would like to generate receipts. Since the data resides on one board, you can add two DocuGen views. Let's call them "Invoices" and "Receipts". The Invoices view will contain the invoice document template, while the Receipts view will contain the receipts document template.