A new feature launched in May 2017 allows Facebook Group Administrators to link their groups to the Facebook business page.
This is particularly helpful if you want to give extra publicity to the group, and the activity in the group will also help with your edgerank (Facebook algorithm) – if your group is public.
Step 1 – Click on “Groups” on the far left-hand side of your Facebook page.
Step 2 – Click link your group
It's as easy as that!