We are trying to create 3 new 'User Defined Field' in our microsoft Outlook contact database.

we have office 2010 (or if needed for this issue also 2003, 2007 and 2013)

we would like to make use of the categories because there are so many contacts in our database that typing in the category for each contact will take a very long time.

We were wondering if it is actually possible to create more category fields (other than the one already given by default by outlook)

Example:

we needs to categorize contacts into 3 categories like that:

category1 (microsoft outlook contacts default field)
a1
b1

category2
a2
b2
c2

category3
a3
b3

category1 is given by default by outlook, we would have to create the other 2 fields...

may someone help me?
thanks!