Hi,
What I understood from the post is that you already have a package in IS and you want to build and deploy process in Designer and generated services should go into already existing package… if this is correct assumption then YES its possible.
Click on the process and then go to Properties → Advanced → Run Time and there you can mention the name of the already existing package in “Generated Package Name”.
After you build and deploy the process components will be created in a subfolder named like _.
Hope this helps.
Regards,
Sumit
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