Is there only one vendor ID per report?
If so use an append.
Also use an append if there is more than one vendor ID and a recognisable pattern repeats when a new vendor number section starts.
Only use a Page header if you have to for other purposes - for header data on the same line for example - and be sure that if you do use the page header template the number of rows or report per vendor does not exceed the maximum number of rows possible between page breaks. (256 lines)