Eugene,
The great problem here is when you add or delete a line.
As I wrote, using Multi-Find/Change, you can launch 2 regex:
- the first searches all the paras with "Line_Blue" applied and applies "Line_White" para style;
- the second does what I wrote above (post#2).
Another problem (you're right!) is when you several lines with the same para style…
If 1 line, my approach is interesting … but if more, use a table is good for me.
I think we can mix the two ways: A table structure with para styles with para rules.
I've tested it quickly and easily with QuicKeys. So, can be done with [JS].