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Hi, We are trying to simulate a warehouse unit repair process in which a unit arrives, goes through a Disassembly phase of a few steps, goes to an inventory step to get the sub-parts needed for the repair, and then goes though an Assembly phase of a few steps. The unit should be assigned a technician (we have set up about 30 Resources, one to represent each technician) that will work on the unit through the collection of work stations for Disassembly. However, only a technician trained to work on that unit can work on it. We have a list in Excel of all work units and the technicians that are trained on the unit. After the Inventory work station, another technician (ideally the same one, but in general just any technician trained on the unit) will be assigned to the unit for the workstations in the Assembly phase. We are trying to use Add-on processes to properly assign the technicians to work units by Seizing and Releasing the technician at the appropriate points in the flow. The idea is to model the delays that occur when a unit comes in and has to wait until a trained-on-that-unit technician is available to work on it. We are not sure how to import the list of Units and their Trained Technicians and how to model the Seizing appropriately. There are too many work units to just make a separate list of trained technicians for each unit. Thanks. Simio-Deterministic.spfx