Hiya DL,
The simplest and best way is - assuming you have saved your choices as presets (you can always go back in and do that) - is to export and import them:
Insert > WebAssist > Preset Manager
Choose the product (CSS Form Builder) > Choose one or more of your saved presets > Export.
This saves them to your machine as a zip file which you can then put on your other machine and import using the same process (import).