Common Url for the user for login into different Applications

i am using Thingworx applications, which was enabled with SSO, i have totally 3 plants with different url's when the plant person login into common Url it should be redirect to particular URL of the plant person, if the user was assigned with  all plants it should shows the 3 plant link details after clicking the particular plant it should redirects to particular plant to access the application of the user. how can i done?