You can save a Draft of an envelope to complete later. What you may be alluding to is the creation or usage of a Template that has set structure for the Recipients and the Email Subject and Email Body of those Recipients, which when applied to an envelope could be modified prior to Sending the envelope. I use Templates in a variety of ways and one of those methods is an Overlay. So I setup two Templates with the same blank document, then set different Recipient structures and emails to accommodate for different needs when the envelope is created. One circumstance might apply 3 Recipients each with unique emails, and another applies 3 Recipients but with one generic email for all 3. So I would suggest using or exploring Templates as the answer to your question. Here is a DocuSign article as a good starting point but feel free to ask follow-up questions...
https://support.docusign.com/en/guides/ndse-user-guide-create-templates