1. On the REPLY PAGE tab
of your event you can set a general setting, which allows ALL RECIPIENTS to bring an accompanying guest:
2. On the RECIPIENTS tab of your event:
you can add and remove "accompanying guests" (Plus 1s) from all (below image) or selected recipients
3. On the RECIPIENTS tab of your event:
You can edit each recipient and allow each recipient to bring more or less accompanying guests (Plus 1s)
CLICK ON THE GREEN + to ADD and on the RED - to remove.