Hello I am contractor I received payment direct bank account then I will transfer to main account for expenses so so the problem is I don’t it any sale item or goods I’m only contractor
You need to issue an invoice to whoever you contracted to and when they pay you allocate the money to the invoice. Read the guides re invoices and receiving money.
you can create the various services you provide as non inventory items and select the same when making an invoice.
please read the guide about non inventory items.