Do not show vehicle cost on shared inventory

I have multiple dealerships that share used inventory across each lot. Our vehicle costs aren't always up to date. Without DMS access to the other lots to confirm that all costs are correctly accounted for, sales staff can't be sure whether the cost value can be trusted.

To help with this, I would like a setting that ignores vehicle cost on shared inventory.

For example, suppose stock #1234 belongs to ABC Motors. When using this vehicle at ABC Motors, I would see the vehicle cost on my deal. When desking this vehicle at 123 Motors, who shares this inventory unit, then the vehicle cost would not be shown, because staff at that store do not have full access to see the breakdown of those costs and ensure their validity.