Don't know about the cooktop but here is a video for a Bluestar range:

https://vimeo.com/222722731

Yes, conversion is usually fairly simple: remove existing orifice(s), which are small fittings In the gas lines within the appliance, and replace with different ones. The orifices are usually easy to access.

The onboard gas regulator will also need to be set to produce propane pressure.

https://bluestar-store.mwrc.net/en/product.php?product_id=69384

Thanks!!

Will converting reduce the btu’s usually it does on other brands

It should not alter the BTU output because the gas orifice is changed to compensate for it.

Sorry for delay thank you ‘

Appreciate everyone’s help here ! Thank you