@Zsuzsanna Huszti, there may be a better way to do this (plugin, export and import, etc.) but here is likely what I would try first along w/ some questions, thoughts and considerations.
Let me preference this w/ I have not done this specific scenario so take my advice w/ that in mind.
First, I will ask knowing full well you probably have thought of this and made up your mind already. Is this really what you want to do? What is driving you in this direction? Don't need an answer here just something to consider before moving forward.
Second, how many issues do you have in each project? 10s, 100s, 1000s? That might influence the approach. If 10s of thousands then I would likely explore an export and import scenario.
A big factor in success or at least effort lies in the question - "How different are the three projects?". Are the workflows, custom fields, screens and schemes the same? If identical or close then it is likely to go smoothly. This goes back to my first point. Obviously when you move to a single project any uniqueness of any project is out the window.
That out of the way let's jump into a possible solution, one that I would likely take on. My approach would be to use the bulk move method. Especially if there are only 100s. Note you will be limited to 1000 at a time. There are ways around this but we won't go there right now. Here is how I would likely proceed. I say likely because I don't know your details.
- Decide whether you use an existing project to import the other two into or create a new one. If one of the current projects has exactly, or very close to, what you want in the way of workflows, screen, etc. then use it as the end project. I likely would stick w/ the same key and project name though. If you want to start clean w/ new name/key then just do that as you don't have to make any compromises. Let's assume you want a new project for the sake of continuing here.
- Create the new project taking care and experience to configure workflows, screens, etc. the way you want. This is a key point especially where workflows are concerned. Obviously Moves are easiest when the workflows are the same otherwise you have to perform a lot of mapping. Moves are even more messy if you have multiple workflows based upon issue types.
- Start with a test. Create a test issue in each of the three projects and move them to the new project. See if things are as you desire.
- Once happy with things then run a filter for the entire project and perform a bulk move. if you have different workflows for different issue types then move by issue type as you can't perform bulk moves across multiple workflows at once.
hope this helps.
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