اريد معرفة كيف يمكن جعل الlist item    T-list نختار منها اكثر من قيمة

I was thinking about that and I had envisioned a selection made, the page is "submitted", the region displayed. Another selection is made, the page is "submitted", the region displayed keeping the previous selections since they are already set. Something like that.

How would your idea about a button to set session using Checkboxes instead of a Multi-Select List work?