Tables relationship question

Hi

I have a master child relationship between tblEquipmentGroup and tblEquipment tables as per below image.

How can I set the relationship between these two with the third table tblEquipmentTransactions so that user can select value for tblEquipmentTransactions.Equipment_EquipmentGroup field either from the tblEquipmentGroup or the tblEquipment table? For example user may want to select ‘Bar Equipment’ from tblEquipmentGroup or ‘Wine Glass’ from the tblEquipment for tblEquipmentTransactions.Equipment_EquipmentGroup field?

Thanks

Regards