Request new account (syensqo.com email address) on gitlab.syensqo.com

through helix ticket : Application Access Request (Generic)

Go to gitlab.solvay.com and access project/repo setting page and export the project .

download the exported project file

Go to gitlab.syensqo.com and login with syensqo account,

Go to group folder where you want to store the repo and select "import project"

Select gitalb export during import project and upload 

Provide project name and select the correct group name with uploaded import project file