If you are no longer interested in a particular car or have changed your mind about which model you want, you can easily archive it from your showroom:
1) Go to Your Showroom and find the build that you wish to remove
2) Click the dustbin icon in the top right hand corner
You will no longer be able to see the car in your showroom. However, you will still be able to find it - and all previously archived builds - from Your archived builds:
Once a car has been archived you cannot move it back to your showroom but you can still message and call the dealers who quoted you.