Hello and welcome to the Seamly forum, @Greta_Dancso
When moving & rotating you need to make yourself very clear on what you are moving to where, because the default point of origin is set to the center point between 2 points of the move. If the 2 points are not connected with a line, I like to place a line connecting them.
In this case, I am moving point A8 over to A5, so the 1st thing to do is to set the Origin Point to A8:
The next is to enter the angle that A8 needs to travel to connect with A5, so this is the formula of the line between the 2 points:
The Length is the length of the line between the 2 points:
Next is to enter the rotation. In this case, you want to connect the 2 side seams to check if the armhole curve will continue from the one piece to the other smoothly. So the rotation is the angle of the line A8 to A15 minus the angle of the line A5 to A7:
In this image, I have clicked on the Apply to check that it has moved and rotated correctly.
If everything is correct, then click OK. and this is the result:
As you can see, the side seam points are on top of each other and the curve is continuous from the back to the front.
If the curve is not continuous, then you need to adjust the original curves.
The process is the same for the upper part. Normally you will need to place a line between the 2 shoulder tips:
After this, the process is the same:
While doing the rotations, remember the direction that the lines are created. In this case, the front shoulder seam was from shoulder tip to neck side while the back was from neck side to shoulder tip, therefore I deducted 180° from the front shoulder seam.
If there are darts on the shoulder seam and you want to check the neck line, you’ll need to do a separate move & rotate, draw a line from the front neck side to the back neck side and use the portions of shoulder seams between the neck sides and the darts for the rotation angles.
Here is my slap-up example with the rotations so that you can see what I did:
Test pattern.sm2d (7.5 KB)
I hope this helps you.