Hi,

it is possible to use the API's especially the Plain Java Client Library to create team areas and assign users. There is a Snippet that ships with the plain java client libraries that creates a project area ans also a team area, snippet3.java I believe.
I am pretty sure this has also discussed here in the forum and there is example code but I was not able to find a lot using https://www.google.com/search?q=ITeamArea+fite:jazz.net.
Here some example code

	public static ITeamArea createTeamArea(String teamAreaName,
			IProjectArea projectArea, IProcessItemService itemService,
			IProgressMonitor monitor) throws TeamRepositoryException {
		ITeamArea teamArea = itemService.createTeamArea();
		teamArea.setName(teamAreaName);
		//teamArea.addMember(teamRepository.loggedInContributor());
		teamArea.setProjectArea(projectArea);
		projectArea = (IProjectArea) itemService.getMutableCopy(projectArea);
	
		projectArea.getTeamAreaHierarchy().addRoot(teamArea,
				projectArea.getDevelopmentLines()[0]);
		IProcessItem[] items = itemService.save(new IProcessItem[] {
				projectArea, teamArea }, monitor);
		teamArea = (ITeamArea) items[1];
	
		IProcessAreaWorkingCopy areaWc = (IProcessAreaWorkingCopy) itemService
				.getWorkingCopyManager().createPrivateWorkingCopy(teamArea);
		areaWc.save(monitor);
		return teamArea;
	}

	public static void addMemberToProcessArea(IContributor user, IRole role,
			IProcessArea processArea, IProcessItemService itemService,
			IProgressMonitor monitor) throws TeamRepositoryException {
		IProcessAreaWorkingCopy areaWc = (IProcessAreaWorkingCopy) itemService
				.getWorkingCopyManager().createPrivateWorkingCopy(
						processArea);
		areaWc.getTeam().addContributorsSettingRoleCast(
				new IContributor[] { user }, new IRole[] { role });
		areaWc.save(monitor);
	}

addMemberToProcessArea