Yes, you can post to more than one group! Once you have your selected the items on your Manage Inventory page, you are able to post those items to as many groups as you would like.
Posting to another Facebook group:
If your items are already posted to one group, go to your Manage Inventory page, under the Inventory tab. Scroll down and make sure you select and highlight the items you want to post. Scroll down and click "Post Selected to Facebook." Then the form to select your new group and albums with appear. You can then also add your claim link and then decide if you will post now or schedule for later.
Posting to an STR party:
If your itms are already posted in a Facebook group or other STR Party, go to your Manage Inventory page, under the Inventory tab. Scroll down and make sure you select and highlight the items you want to post. Then scroll down and click "Add Selected to Parties." You will be given the option to select which Party you would like to add to. Select and confirm.