a way to only select objects that intersect in one spline.

it isn't an easy task especially if spline contains holes

Thank you for reply
There is no hole
Only 1 rectangle spline

this will select all objects which bounding boxes are intersecting with the rectangle's bounding box

(
  rect = selection[1]
  select (for obj in objects where intersects obj rect collect obj)
  deselect rect
)

if your rectangle is rotated about Z axis then it requires a bit trickier solution

Wow
thank you
I will test
Really thank you

Wow
thank you
I will test
Really thank you