Hello Adobe Social Product Champions,
While creating posts from the Publisher or the Content Calendar, you can save the posts in an intermediate state as drafts. You can also create a template to use as a starting point for future posts.
Here is the link to the in-product help article to get you started: https://marketing.adobe.com/resources/help/en_US/social/t_pub_cnt_cal_drafts.html
Thanks & Regards,
Adobe Social Product Community Team