How formula with dot works?

From Macrobond formula language building blocks you can create more complicated formulas. They are called 'user defined formulas' and have a dot at the beginning. To see the elements of the formula select Edit from the main menu at the top of the application and click 'User defined functions.' In new window navigate to the right department (note that such formula can exist only in document) and find formula.
If you want to edit formula for another series, you need to replace all series inside user defined formula as well:

For more information:

Formula analysis

User defined formulas