If you like to add more than 1 or 2 Users to a Securitygroup you probably faced the fact you can’t select the users you want in the group. Here is an easy workaround to add Bulk AD Users to a Group.
1.) Create an AD Security Group navigate to Members and press Add and on the 2 Form click Advanced
2.) Click on Path
3.) Navigate to your AD OU where all the Users are you want, Select the OU Container and press OK
4.) Select the User with CTRL and Mouseclick and press OK.
After this you have your Security Group filled with your Users