Add column data to existing table?

Add column data to existing table?

Anyone know how to add column data en mass to an existing table? I have a table with members in it and I want to add a column with ID numbers in it to the table. I have the ID numbers and the table with the members in it sorted. I need to figure out how to add those numbers to the table so I do not have to type them all by hand.

Cheers,

Dave