Hey, sorry for the late reply. I am more active on discord (my discord name is worthy.osrs). So, not sure if I understand the question correctly, but the preset should only have to be created once, as long as your house configuration does not change. If say you wanted it to create mahogany tables in a different room than the one where you originally set up the preset originally, you would have to re-create the preset. When doing so, the new preset would overwrite the old one and keep the same spot in the drop-down box.
Not sure if that answered your question (?) but feel free to message me on discord (preferred) or here if you need more help. Also feel free to send a picture/gif as that might explain the issue better.