when i add a constraint like parallal to z then it all goes red and says unsolvaeable?
this happens quite often for me in 3d sketches for weldments.
everything is correct.
is this normal?
Getting the unsolveable notice is common, I don't know about normal. You say everything is correct, and it may be, but are you sure that there isn't a relation or dimension that's preventing the parallel relation? It's pretty easy to get unwanted or unintended sketch relations in 3d sketches. Can you post the file? (Click on "Use advanced editor" at top right to post files.)
3D sketches can get flaky. Sometimes it's best to construct a series of simpler sketches to get what you need.
i changed from parallel to one line to perpendicular to another and everything was ok then...
Retrieving data ...