cut a solid with a surface

[alex369]

Hello everyone,
for a few days, as someone has already read, I am working on the fuselage of a aircraft (enormous steps have been moved only thanks to your help) and now it is time to do the interior. for convenience I would need to "cut" the fuselage in half, just like a sandwich, so as to work the interior and, at the same time, not seeing "the roof".

In practice I would need a surface, even a simple horizontal line, perpendicular to the axis of the fuselage, which "going" from bow to stern, cuts me the solid in two half (so that I hide the upper part and work the interior).

I tried to enter, of course, into shape design and I traced a line in the reference plan. through the menu "insert" I then tried to cut, but I did not understand what faces it wants to select.

Can anyone direct me to the right path?

 

[alex369]

I solved the problem this way.
I tracked a line (or curve, does the same) and extruded a surface that cut the solid in two half. After that, in partdesign, I selected "floor-based slices -> size" and removed the top of the solid, so as to leave the lower one and work inside. at the end of the process I eliminated, from the features tree, the "cut" previously imposed, making recomparison the part of solid removed.

for convenience issues I left the surface in the tree, so that I can later cut out the solid and point out the details of the interior.