Say I have two companies A and B. I want naming for Sales Invoice to be set by user in A and I want B to use a series as naming. Is that possible?
Yes, possible @zeeeeeeeero.
Please check this thread. this may help.
How do I do it? Preferably without scripts
@zeeeeeeeero Or you can add these two series in the DocType Document naming settings then after update. You can select manually based on the company before saving the document.
For your Reference: