Let's consider the option of creating armor through the Chess section.
On the main screen, left-click Chess.
Something like this picture appears.
Hover the mouse cursor over the desired number, category, and date. Left-click on the check-in date and drag the mouse to the desired check-out day and click the left mouse button again.
If everything is done correctly, a window will open where you can enter the booking and guest parameters. As soon as all the data is entered, click Book.