In RC-PIER loads are generated based on dimensions of structural elements of the pier. Making changes to geometry invalidates generated loads. In this case the program will automatically delete existing loads. In this case the designer should re-generate loads based on the newly modified geometry.
Loads can also be input manually. In this case the designer may chose to keep the loads while changing the geometry.
By default the program offers the option of keeping existing loads. If the box at the bottom left of the Loads tab is checked the designer enables the program to keep track of geometry changes and erase existing loading.