Thanks for your reply.
But is it also possible to create a folder automatic when a new account is created (with a workflow).
I want to do this because, when creating a folder in the account entity, it places an ID after the name (example: sharepointsite/account/companyname_D02345346...)
The problem is, when creating a document folder for the opportunities, CRM creates another document location (sharepointsite/accout/companyname/opportunity/nameOfTheOpportunity).
So I have 2 different folders for 1 account (1 with the unique ID, and one without this ID).
Any suggestions?