I use a lot of tabs to join pieces together that are not a box. I have gotten this to a pretty simple process and thought I would share it.
First draw a line that represents the edge to have tabs put on it or in it. Then draw one side with the ends joins attached.
Dim the end and remember the dim number in this case d10.
In the sketch menu bring up Rectangular Pattern and fill in as follows. Use your number of tabs and Dimension number.
Copy the edge line up the amount of your material thickness(in my case .197[Lowes 5mm birch ply]).
Break the lines where you need to clean up the lines and then trim.
Voila! Equally spaced tabs across a known edge length. If you want closed tabs on both ends use an even number of tabs. I used an odd number and so I have an open and closed tab on the ends.
Hope this makes Sense. At least it does to me.