On the overview panel click Build.

Add a parcel/s by hold down shift and click on the parcel you want to add.

You can unselect a parcel by unticking the tick box from the Build property panel.

I.e. A1, B1 or C1.

Once all parcels are selected, click Save Property, this will create a custom farm.

Name the farm, this is searchable within the Work Folder.