I import data using excel files. I'll have columns for name, address, email,
etc. I add on a last column called "Category". For each contact I want to
import, I put in this column a category name matching one of my categories in
BCM. Generally when I import, all my data is going to one category, so it's
just a couple clicks copy and paste the category name for all the names I'm
importing.
When my excel file is set, then I use the import wizard in BCM to import. On
the mapping page of the import wizard I make sure to map the excel "category"
column to the BCM category. When the import is finished, all my new contacts
have been automatically assigned to the category I specified.