No. Not the draft angle.
The slopes on the tops of the the ribs.
I made the quarter of the table a component making sure it shows as solid in Entity Info and then drew the ribs outside of the component making sure they extend into the central collar for the post. I started by drawing a face.
Push/Pull to give it thickness and copy the geometry to the other side…
Then with both of the ribs selected, I made a component and made sure it shows as solid. I made the ribs a component although later I will explode it. If I screw something up after exploding the component, I’ll still have the component in the In Model components so I don’t have to start over completely.
I used the Trim tool from Eneroth Solid Tools to trim the ribs to the center collar.
Then I exploded the rib component and while the geometry was still selected, I cut it to the clipboard (Ctrl+X). Next I opened the quarter table component for editing and used Paste in place to paste the rib geometry into the component.
Finally, erase any coplanar edges and make sure there are no internal faces or stray edges. The quarter table should be shown as solid in Entity Info when finished.