copy part of polyline if it is higher than the viewport of paper

[imagination_s]

Hellow Everyone,

I have a project where the threat is to copy part of polyline if the polyline is biger than the viewport or the paper

The problem is to figure it out where the exact spot of the polyline intersect with the viewport to copy it in another layout pice by pice for each part where it overcom the viewport.

The picture show what is that i want

Please give me a clue or how to do this

Thankyou so much.