Press the B key on your keyboard to open the build menu while you are in your territory.
In the build menu, look for the House Blueprint section in the top right corner. You will also see a Presets option, which contains various pre-made structures you can build if you have the necessary materials. However, if you only want to save your base blueprint, you can ignore it.
To save your base, click on the Draft option in the House Blueprint menu and then select Add Blueprint.
You will be given two options, Save the Whole Base- Choose this option if you want to save your entire base; Save a Single Building- Choose this option if you only want to save a specific building within your base.
If you choose "Save a Single Building," you will need to select the specific structures you want to save. Left-click to select them, and when finished, press the F key to confirm your selection.
However, if you choose the "Whole Base" option, then everything inside your territory will be saved.
After saving your structures, you will be prompted to name your blueprint.
Enter a name for your blueprint and add a description if you want.
Press F to confirm, or click to save your blueprint.