Implement thickening of exercise grids at intervals of N

Two days ago, I began to learn how to make reports and found that the customer's requirements were rough at every five exercise lines, as shown in.

After thinking about it for a long time, I suddenly thought of a solution last night. I could try it in the early morning. Remember to use it for work next week.
In fact, it is very simple to Add a new section in the detailed information, put a rough line in this section, and then drag it up, the line in B can cover the line of section.
Next, select an expert, select section B, check suppress display, and click X2 next to recordnumber mod 5 <> 0
The result is as follows.