Welcome. You are looking for a bit that's used to cut picture frame material. There are an incredible number of shapes. Here is a sampler from Amazon: https://www.amazon.com/Meihejia-Arc...x=frame+maker+router+bit+sets,aps,1268&sr=8-5
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There are a lot of different shapes. Remember that the cut is the reverse of the shape. It is very difficult to match old trim since so much of it was milled locally using shaper bits custom made for the purpose and mill.
Thank you so much, Tom! I know how difficult is to match an existing mounding!
I truly appreciate everyone’s assistance in helping me with my projects!
You are all the best!