Can we have a three columns in y-axis instead of one column? I am a beginner for dhtmlx components. Please help me out.
Yes. It can be done using timeline_scale_label template.
Please find the description how to implement it in the tutorial - “Step 4 – Adding multiple columns to the left part of the timeline”: https://dhtmlx.com/blog/how-to-make-hotel-booking-calendar/
Is this possible in scheduler version 4.0.10?
Can’t say, because 4.0 released more than 6 years ago and I don’t have a package with this version.
Try to use timeline_scale_label template to return any value. If it works, I think, the way described in the tutorial also will work correctly.