The Form's source is here .

How to import Form into the system see here . 

Create and save a new form

Launch an XLSX Workbench, and create a new form with name SUBTOTALS_2  .

Assign a context to the form 

Assign a context ZCONTEXT_SUBTOTALS_2 to the form. 

When an automatically creation of the Form structure will be prompted, you should press the button  

to create a structure manually.

Markup of template 

Markup an Excel-template as shown below :

 Create a Form structure

Add the new components into form structure as shown in the picture below:

Go to TOTAL_SEATOCC component properties tab, and set radiobutton "Formula" in the item Layout Options:

Template binding for components

Perform template binding for Patterns and Values according to scheme below:  

Context binding for components

Perform Context binding for «Loopstep» and «Values» according to scheme below:

Activate the Form by pressing a button