[Plugin: Custom Field Template] Drop down select with Post ID/Title from Category

Great Plugin thx.
I have a CFT where I need to allow user (in Admin) to select multiple posts from a Select box.
Ideally, I would like the select box to be dynamically generated from a given category ID.

To give an example, a admin user is editing a post about a COUNTRY and need to select CITIES from this drop down to make this custom field.
In my template (front end), I will only display ceratin information if some CITIES have been selected.

I was wandering if it is possible?

Thx in advance

S