How to Remove Related Op from Material?

I’m needing to remove the operations from several subassemblies(I’ll be doing this on ~30 BOMs), as we realize the operations belong on the parent part(learning the hard way about subassembly M.O.M.). I found I can’t delete operations where a material references that operation, and I can’t clear the related operation field on the materials. The only solution I can find is to copy all the materials to Excel, delete all materials, delete all operations, then in excel change related operation to nothing and materials from excel back to Epicor.

I’m hoping there is a simpler way, any suggestions?

Sorry as I was taking a screen shot I found I can’t delete this in the detail view but I can in the Material List view!