Sales tax and Income account from Invoice to General Ledger

SUGGESTED

I have a client who has hundreds of invoices to bill clients. They also have various inventory items of which it assigns a cost and charges sales tax. Is there anyway to combine sales tax of an invoice into one line item instead of separate sales tax for each inventory item on an invoice? Same with income accounts, can the invoice be combined to have one amount for each invoice instead of an income for each line item on the invoice?

Hopefully this makes sense. my goal is to combine the amounts into one invoice and reduce the page numbers to clean up general ledger.

Thank you,