Win2003: How to move the members of a group to another group

Hello everyone.

I have the following problem.

I created in Windows 2003 Server a security global group “groupA” that it has 40 members.

I did the same for a security global group “groupB” that it contains 80 members.

My problem is how can I select all the members of “groupA” and move them to “groupB” automatically. I want to avoid moving accounts one by one.

Thank you in advance.