Hi How can I retrieve a logged in user's group id in a process if

Hi Lincoln,
Take a look at the People Functions - Plug-in available in Shared Components. You can retrieve all of the groups a user is a member of using the getgroupsformemberuser function included in that plug-in.

Hi Michael,
If user has been assigned to more than 5 groups,
assume
1) Italy
2) France
3)SuperAdmin
4)SupportAdmin
5)CentralTeam(Parent Group for 1,2).
How can I validate and get Group ID of user whether he belongs to group1 or group 2.

first you can check if the user is part of a particular group using the function isusermemberofgroup(loggedInUser(), cons!GROUP_NAME)
you can use the group() function....group(cons!GROUP_NAME, "id"). to retrieve the id

I agree with Michael and Aswin on how to get this done.

However, I would recommend a proactive approach to managing group membership that empowers you to avoid this to the greatest extent possible. This operation demands a lot of performance.

RI Array: ri!userBelongsToTheseGroups in following code will give you list of desired groups.

a!forEach(
items: ri!listOfGroups,
expression: if(
isusermemberofgroup(ri!userName, group(fv!item, "id")),
a!save(ri!userBelongsToTheseGroups, fv!item),
{}
)
)