Yes, you can do control iin Regression analysis. you have to do hierrarchical regression; in the early step you enter the variable (variables) you intend to control for, in the next step you enter the main variables in the regression equation.
Yo can handling control variable with Amos easily. Please see at this link:http://statwiki.kolobkreations.com/wiki/Structural_Equation_Modeling. There is some explanation and guideline to practice control variable