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Yes, you can add multiple 1095-A's to your return.

If you have already entered one 1095-A, type '1095-a' in the Search area, then click on 'Jump to 1095-a'.

You may be asked about Unemployment first.  Continue, and you will see a screen 'Here's what we have for your 1095-A' 

At the bottom, click on 'Add Another' (screenshot). 

Here's the steps on How to Enter 1095-A.