Virtuemart excel-like : make option selectable

Hello,

I use many Custom Field and certains of those have defaut values, e.g. "1", "2", "3"

How can I make this 3 options selectionable in a cell in back-office instead of typing it ? I wish to have a display like the Manufacturer or Categories column cells, where I can pick the existing options whith mouse on a cell ("Select an Option").

Many thanks for help,

Zal

ok, I tried but no such sql skills for that, it is a generic chain field but not listed as well known ;

Iit sould be great to have by default the selectables default values of such a custom field we have before define in usual VM back-office