This feature seems to be bugged and no fix is in sight. There are two options: You can either copy the relevant crafting station and copy+remap the fitting primal item, and then edit the structure, make a child of the crafting station and subclass+remap the fitting primal item and use a graph to add additional engrams.
The first option has the advantage of requiring no graph coding and being generally stable, while the second method has the advantage that updates to the default engrams of the vanilla station will be included automatically.