Disable one variable, having to enter value to another variable

I have a web template having 2 queries. Both the Queris have varibles.

In Query1(built from Infoset)the variable populating is 'MPM Title'.

In Query2(built from Multi Provider)the variable populating is 'Top title'.

Both variables have same values except thei technical names since they have been derived from different infoproviders.

The users always enter the same value in both the variables but now they want to avoid one variable 'top title'so only MPM Title should populate always in variable screen.

Overall what I mean is the MPM Title variable value should be feeded to Top title variable and this Top Title should not apper on the screen.

Thanks in ADV