input box association with field from table

[rdsuperlike]

I want a input box with number of days in dropdown. But i want those days from a field.

So the dropdown should have below list:

10,20,30,40,50,60

I had defined a variable days but how do i associate that variable to a column coming from one of the tables?

[sunny_talwar]

Try something like this:

[maxgro]

or maybe a multibox with the field?