When I buy a a new horse cart what happens to it?

Go in your house and look at the table next to the chest. You can see a mini horse cart next to the radio. Press A at the mini horse cart and you can choose your horse cart

When you buy a new cart you go in your house and on the table where your calender and radio is (if you do not have the radio yet you should get an offer for it in the first yr. On Blue Bells request board). On that table there is a small cart, stand in front of it and when the letter A appears press A. Now you will see all your carts. The only thing is if you have to much stuff in the cart you already use your new one MIGHT need to be upgraded to switch it.

You must go inside your house first. On the side of the room you will see a mini cart on a shelf. Go over to it and hit a. Then just switch out carts.