It’s linked the the energy source, but to physical item too. The physical part doesn’t matter as this is some material thing used as anchor to attach this energy to it.
If mandala is destroyed, the energy will continue to work with you as it creates cords. If you want to stop some field, have to cut the cord with this or just deactivate it.
This is interesting question. I didn’t tested this, but i think this should work with your intention, as the mandalas work very intelligent.