Allegro Design Entry HDL 16.6 Hierarchy - How does it work

I have used hierarchy designs before using OrCAD Capture and it was easy and intuitive to use.

But how do you use hierarchy designs using Design Entry HDL? I have a few designs with the top level set, I add blocks to my top level and I get errors saying there are ports not available in the lower sheets. But how do I add these? How are nets named across sheets? How are additional ports added to both lower and upper level pages and blocks? How is the multi-sheet environment controlled to maintain the part idents seperate? I have one sub-level with 3 sheets and another with 2 sheets, but the page numbers go 1/3, 1/3, 2/3, 3/3, 1/2, 2/2??? there are 6 sheets (including the top level) the hierarchy shows the pages as 1, 2, 3, 4, 5, 6 but the actual page borders are nothing like the correct order or quantity.