This may be a daft question but, is it likely to be possible to trade in a moto when buying a new one?

If it is, can anyone help me with the terminology that I may need please?

Maybe something like this:
Quiero comprar una moto nueva y usar la mia como parte del pago, ¿es posible?

Thank you. I'll give it a try.

I would still like to know if it's a usual practice here though. Does anyone know?

I always thought you only bought a new moto when the old one had been stolen, therefore no trade in

where it parked ?