How to create a Castellated Structural Member

Hi,

I am trying to create a castellated channel structural member to be used in the weldment feature. I tried searching the internet but could not find it. Can anyone show me how to do it?

Here is an example of what I am trying to replicate. I can create the profile but with the castellated holes, I cannot seem to figure out how to do it.

Appreciate any assistance.

SolidworksDrawings And Detailing