Use query or SQL to solve your problem .
Something like this
strSql = "INSERT INTO YourTBL (Firma,Factuurnummer,maand,Soort,Transport,Product)" & _
" SELECT [Forms]![YourFormName]![Firma] AS S1,[Forms]![YourFormName]![Factuurnummer] AS S2,[Forms]![YourFormName]![maand] AS...