Isochrones center

Is there any way to split the isochrones in Multipolygons? I’m really new to this and I did put a lot of effort trying to figure it out how to do it , so it could be really hard for me to explain, sorry about that.

I generated some isochrones but when I put on a map and click in each interval, the “highlighted” area covers all others contours (overlapping then) in this area. I was think if it possible to get polygons that limited its area until the limit of the next contour. Something like this:

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So, the B area instead of sums up of the area of C. I just need some help to figure it out how to make my isochrones look like that.

Thank you.

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