Trigger opening user form

If i have two user forms usrform1 and usrform2 and in the usrform 1 there is cmb box with data validation list that have options such as cut, damage property...etc, So id i selected cut then pressed add button, I need new form to be opened automatically to add new data related to cut, how can is make that.

.
In the code for the ADD BUTTON, the last line of code should be :

Please Login or Register  to view this content.