The same "Y" value for selected points

[Hrvoje-]

Hi!

Can I, somehow, set the same "Y" value for the points marked on the drawing?

Thank you for the help!

[lichtzeichenanlage]

Hard to say (for me) what your design looks like. Perhaps you can share a link or export your design.

[laughingcreek · Accepted solution]

The flatten command will place all the control points on the same plane with the right setting and plane selection.

[laughingcreek]

Also, while in "edit form mode" selecting the scale handle onthe Y  side and pulling it will bring all the selected points to the same plane. 

[Hrvoje-]

Here is the link: my project

I hope that the link will work.

[lichtzeichenanlage]

The link worked. But unfortunately I can't help you because I haven't done anything (more or less) in the modle environment.
I'd tried to modle a boat and learned that things like this often be done in the patch environment. Even if it's hard to get (perhaps just for me) but less rails and guides are better than lots of them. But the loft command is not an easy tool (perhaps only for me again ;-)) but this post from  @jeff.strater helped me more than just a bit to understand the loft command. The following vidow from @Beyondforce shows nicely what's a good way to modle a boat.

I bet that the experts in this forum will give you good hints (like they did already). 

[Hrvoje-]

Thank you gentlmen for the help.