Newbie Numpty Question re Maps

I have purchased the GPSMAP 66 SR and starting to plough my way through the manuals and you tube videos. I am based in the UK and have bought the UK pro 1:50 map. 

I am stumped on the following issues.

1 - How do I remove the TopoActive America, south 2020.10, TopoActive Europe 2020. North East and South West. Garmin express wants to update these at 3G each

2 - The micro sd card which has the TOPO Great Britain PRO 1:50K is it possible to copy this onto either the device directly or onto a much lager card.

Thanks In Advance