>I would like to have a combobox which allows selection from the list or custom entry on a value - I would like this custom value to be displayed and stored to the controlsource - but Not added to the permanent list. I am populating the list with a field from a table - rowsource type =6. What do I need to do?

First you need to popular the list using a different rowsource type ...
type 6 being bound to a table is hard to expand.
Try using an array ... and then handle the new values in the valid/interactive change section.

Alternatively you could create a local view and still us type 6 ... and do an add record to the view again thru valid/interactive change.