There are two ways of handling tooling in Epicor… either as a Part or as a Resource.
Generally speaking, if the tool is an asset which is maintained and depreciated, it would be a Resource and added as a Scheduling Resource to the Operation record… whereas if it is more of a commodity item it would be a Part and issued to (or bought to) the job as a material.
In the scenario you describe, it would likely be closer to the Part side of the equation, so you’d create a Part master record… and then either add it to the Material list on the BOM beforehand OR someone would have to manually add it to the job so it could be issued (or purchased direct).