To be able to project edges you must click in the view first.
To make a section in an odd angle make a view sketch, project an edge and draw a line parallel to the projected.
RMB on this line and choose Section...
HTH
Peer
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Iv2018/Vault Professional 2018
Lenovo ThinkStation P720
Intel Xeon Gold 5122 - 3.6GHZ
32GB RAM - Win10/64Bit
Lenovo Thinkvision 27"; 2560 x 1440
nVidia Quadro P2000 - 5GB 25.21.14.1771
3Dconnexion SpaceNavigator 10.5.4