Like any other Bluetooth headphones, Woojer Edge is not a Bluetooth transmitter but a receiver. Therefore, to use Woojer Edge together with wireless headphones, they should both work simultaneously, receiving the audio signals from the same Bluetooth source.
If your audio source supports dual Bluetooth connectivity (e.g.: Samsung Galaxy 8 and above), you just need to pair both to that source. Alternatively, you can use an external dual Bluetooth transmitter. For PC, you can use an external USB Bluetooth dual transmitter.
iPhone users: Since Apple limits that option to Apple-certified devices only, you'll have to use an external transmitter.