Here's what you can do to build a 20x40 tent that is comprised of two 20x20 tents already in your inventory.
**This method can be used for any larger tents that are built of several, smaller tents**
First, ensure that you've got your 20x20 tent built as a Package in your inventory with all of the parts as "Required Contents".
Next, build your 20X40 tent in your Packages section and add your 20x20 tent as contents.
When you add the 20x40 Package to your project, two 20x20 packages will be added. This will add the correct number of parts needed for a larger 20x40 tent.
Need a quick review of how to create packages? Check out the video below: