Ungroup and center the WHITE card base over the green card window by selected both layers and choose align and center.
Add 2 vertical score lines and line up on either side of the white base. Move White Base and select two score lines and green card base and ATTACH
Add horizontal score line and stretch to fit the full width of card grass belly band. Select belly band and score line and align and center and then ATTACH
To make sure Design Space will put all the pieces on one piece of Designer Series Paper, attach all the green pieces as they are set up.