Sounds like you need several tech records that you can all assign to the same work order record and show a specific sequence to the assigned techs. This should be done with separate records instead of a group of fields on the same record. As you have just discovered, that approach can really complicate how you work with your data.
Workorder::WorkOrderID = AssignedTechs::WorkOrderID
Techs::TechID = AssignedTechs::TechID
You can use a portal to assigned techs on your work order layout to list all assigned teches for that work order. A number field defined in AssignedTechs can be used to keep them in the order you need them to be. (And a portal to AssignedTechs on the Techs layout can list all assigned workorders for that tech.)
This is called a many to many relationship. You may want to examine this demo that matches contracts to companies in a many to many relationship to see how it can be set up: