Can I post to multiple Facebook pages through Socioh?

You can publish to ONE Facebook page at a time, but you can choose between different business pages you are admin of. 

Marketing Plan

When you're creating a campaign (Product Sale / Daily Deal / Auto-Pilot / Coupon) you can select the Facebook page you want the posts to be published on your Marketing Plan screen: 

Share a Poster 

If you are creating posters then you can select different Facebook pages before publishing it: 

For Q-rator

Here too you can create Queues for business pages that are associated with your Facebook account (used to create the Socioh account).

Also see: 

What is a Queue? How can I add one?