Hello everyone! I wanted to ask can i do pattern manipulation in Seamly or should I do this on my own after printing?
I’ve already drafted the basic bodice
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Hello @H_A Welcome to Seamly!
You can certainly perform pattern manipulations in Seamly2D. The tools in the Operations toolbox: Move, Rotate, Mirror, etc. are what you’ll be using. I know that @Grace & @Douglas have experience with using those functions, & @fashion.patron has a number of highly recommended tutorials on YouTube which I believe include manipulations, (Unfortunately I have not felt free to take the time to view them myself. 
)
Happy drafting!
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In my opinion, complex pattern manipulation is main drawback of using Seamly2D especially for beginner. It is only available of draft mode, not piece mode, except union. Your draft will be very cluttered and confusing. Many time I have to revise my math and trigonometry. I have been using Seamly for years and only now I am confident doing all the manipulation in Seamly.
That said, once you master it, it is so satisfying. Imagine you can just adjust the whole pattern by changing some parameter. No need for grading anymore. No other program, except the original Valentina can do the same.
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Placing objects in groups allows you to show / hide what you want to see or not.
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That what I did apart from other visual techniques like color, and line types. Eventually I get used to the clutter and didn’t need the visual cue anymore, especially when drafting the same thing. I don’t even draw the pattern outline anymore.
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Hello and welcome to the Seamly forum, @H_A
Yes, and as @najdmie says, it is confusing in the beginning but it’s a very satisfying exercise once you master the technique.
I would suggest that you start by saving a duplicate of your basic bodice pattern so that your base doesn’t get lost.
The bust point is always the rotation point on the front bodice - the same as when you are rotating the darts by hand.
Place a point at half the distance above where you would like the dart to be opened. Place a line from the BP to the new point.
Make sure that the existing dart has lines from the BP to each of the existing dart edges. (For easy formulas, it’s important that the lines are radiating outwards from the BP.)
Using the Rotate tool, select the BP and then, while holding down the CTRL key, all of the points and curves from the new point to the 1st dart side point of the dart (that you want to close) and hit enter.
In the formula box, enter the formula AngleLine_DartLeg2 - AngleLine_DartLeg1 (the formula will change depending on what these are named and which direction you’re working in). Hit OK.
The rotated points will have and extension of _a# appended to the rotated points and the DartLeg1 should be on top of DartLeg2.
Draw in the new lines.
Here’s an example of a dart moved to the side seam:
I hope this helps you.
Edit You can also rotate only a portion of an existing dart (?half?) to have 2 darts, in which case you’ll draw a line from the BP to where you would like to close the existing dart and use the new line in the formula instead of DartLeg2.
This is my collection of rotated darts on this pattern:
I haven’t done them all yet 
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