Hi Michael
Thanks for your quick answers

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I'm not familiar with the "split" script, can you show me where that is located?

you can find the link here :
http://kyticka.webzdarma.cz/3d/moi/
function : Quick Splitting

beginning of the discussion
http://moi3d.com/forum/index.php?webtag=MOI&msg=965.1
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But you can use the regular boolean difference command to make a cut like that.

boolean difference is the function i have used
but we have to do as many Boolean operations as there are parts to be cut
the result is nice and it's a 3D section
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you can also use Construct > Curve > Project to project a line onto objects which will generate section cut curves:

this function is simple and fast but the result is now a 2D section
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it would be nice to cut a group of parts with a plan or a line in one time then select between the 2 groups which one should be masked.

christian