Curious; how did you determine what these 50 constants are?
I don't know the problem you are trying to solve, but here are some thougths:
1) you seem to have been trying to edit the points by modifying the values in the .pts file used to create them. As you discovered, that does not work because there is nothing linking the .pts file to the model. However, it still might be easier to edit the .pts file externally (e.g. using notepad++ or excel), save it, then edit the definition of the point feature, delete the previously imported points from the table and then "import" the updated .pts data.
2) To generate the 2nd curve, ge nerate a copy of the imported points to produce an identical set of points as in step 1. Then edit the relations of this 2nd point feature - and here you have to do the grunt work of writing a relation that describes the x,y,z coordinates of each point in terms of the the x,y,z coordinates of the corresponding point in the 1st point feature. To assist in this, I suggest you right-click on the points features and use the information->feature information tool and look at the last table in the information page - it will show you what dxxx symbols the system assigned to the coordinates. Also, I think you will have to use the $ in your relations (i.e, they wll be of the form $d0 = $d150 + const/2) so as to keep track of the sign.
3) to generate the 3rd curve, copy + paste the points+curve from the 2nd step and edit its relations.
Yes, in total you'll end up with 300 lines of relations, but with copy and paste it shouldn't be that tedious...
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