# Constraints. How to control which curve is master and which’s is following
**URL:** https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815
**Category:** Modeling Questions
**Created:** [November 12, 2021, 3:34pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815 "2021-11-12T15:34:21Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@ilija](https://discourse.shapr3d.com/u/ilija)
#### Post date: [November 12, 2021, 3:34pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815/1 "2021-11-12T15:34:21Z")
Hey there.
How do I control which line is the master line so that the other one is going to change accordingly? In fusion the order of selection decides that. In the given example I want the longer line to be equal to the shorter one, but its always the other way around.
I ve been facing the same problem with all the other constraint when using it on two unlocked curves. Sometimes a huge geometry, consisting of a trillion pieces moves to one tiny line.
Thanks
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### Author:  [@ilija](https://discourse.shapr3d.com/u/ilija)
#### Post date: [November 23, 2021, 2:50pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815/2 "2021-11-23T14:50:51Z")
no ideas??
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### Author:  [@Oregonerd](https://discourse.shapr3d.com/u/Oregonerd)
#### Post date: [November 23, 2021, 3:46pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815/3 "2021-11-23T15:46:21Z")
You can lock points on the line?
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### Author:  [@ilija](https://discourse.shapr3d.com/u/ilija)
#### Post date: [November 23, 2021, 3:49pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815/4 "2021-11-23T15:49:27Z")
Yes. I know =) I was wondering about the hierarchy of clicking. If there is any system behind it like in fusion360.
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### Author:  [@Oregonerd](https://discourse.shapr3d.com/u/Oregonerd)
#### Post date: [November 23, 2021, 3:49pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815/5 "2021-11-23T15:49:37Z")
You can also use the mirror tool. Delete the line and mirror the longer line to the other side.
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### Author:  [@ilija](https://discourse.shapr3d.com/u/ilija)
#### Post date: [November 23, 2021, 3:51pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815/6 "2021-11-23T15:51:19Z")
Yes, thanks for your help =) But it´s not about drawing the two identical lines. It´s a general question regarding the system of constraints.
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### Author:  [@ilija](https://discourse.shapr3d.com/u/ilija)
#### Post date: [November 24, 2021, 4:48pm UTC](https://discourse.shapr3d.com/t/constraints-how-to-control-which-curve-is-master-and-which-s-is-following/15815/8 "2021-11-24T16:48:21Z")
Danke Pascal!! Cheers from Berlin