In CSUM 3.0.35 you can now import groups from another space, re-creating groups with the local Space KEY, retaining the same permission allocation.
The first step in importing a group is to select a space. Click on the input field labelled ‘Choose a space to import groups from’ then begin to type the space name or unique space key. Once three letter have been entered a list of suggestions will appear. Select the space you would like to import groups and users from.
Once a space has been selected the table on the right will be populated with groups that belong to that space.
The table of groups will be displayed along with the potential number of users to be imported also. Check the boxes next to the groups you would like to import
Now leave the 'Import group members option checked if you would like to import the groups along with the group memberships.
Finally click the ‘Import’ button at the bottom of the page when ready.