Polyline and rectangular areas from given points - GSA Grid Area Loads and Polylines

Hi.

It’s difficult to grasp your context with just one (messy) picture.

Please, have a look here: How to ask effective questions

Anyway.
12 Lines crossing other 25 lines create a grid of 11*24=264 cells, not 300.
If i got it wrong, indeed, please attach some relevant data about your situation.

In the meantime, look at this areas.gh (10.3 KB)