Edit mode lock transform to axis permanently

Hi everyone!

My question is: how to lock in edit mode to a single axis when performing multiple consecutive tweaks. I’d like to use the grab tool, and constrain automatically to the “y” axis, without pressing “y” each time invoking the grab tool.

It would be good to have a tweak tool which would allow me to click and drag constrained automatically to the desired axis. I am modeling a tree with splines, in front view I have placed all the vertices and curve segments, now I’d like to move the verts into position on the other axis, without pressing “y” all the time.

Mihály

Thank you