Assign a Client (Customer | Supplier) to an Invoice Assign / Associate a Client to a document (Invoice / Estimate / Purchase Order / Credit Note)
Clear | Remove assigned client (Customer | Supplier) from an Invoice Remove associated / assigned client from a document (Invoice, Estimate, Purchase Order, Credit Note)
Use of Custom fields available in client (Customer | Supplier) and Company Profile Custom fields are given for inserting anything that you want of customer and your company. Whatever you insert in these fields will get reflected on PDF.
Not able to remove / change assigned client from a document If you are trying to change assigned client from a document (Invoice, PO, Credit Note) but not able to do it then this article is for you