How would I best accomplish this splitting of two components?

How best to use the group(2x4) that is “C” to make boards (group A & B) separate. I mean to say create two separate boards A&B utilizing the board labeled “C”.

There are many ways, one way is with solid tools Trim. It will make A and B a group which you can then remake as separate groups or components.
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You could also just trace two edges and use pushpull to remove the overlapping section, or even use adjust the length of AB to just A and copy move another component to make C.
There are endless options.

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Thanks so much. I am getting there. Baby steps it seems sometimes but steady progress! Thank you.

Curious: What do you want in the end? Do you want a single component that has a chunk missing out of the middle? What are you modeling and how will you use the model once it’s complete?

Working on a chicken coop build. I expect to get a cut list and the finished product will be in my back yard. Also working on a basement remodel.

For an accurate cut list, then, however you cut the horizontal piece you’ll need to split it into two separate components. Don’t forget to do that.