A: Login to database through App Designer as a source database.

B: Click on upgrade tab and open the project which contains roles which you want to migrate.

C: Double click on Roles folder under the opened project.

D: Select Action as "Copy".

E: Go to Tools > Copy Project > To Database.....

F: Give database name (Target Database) to which you want to migrate roles.

G: Click on "OK"

H: Select "Roles" from different objects and copy that roles.

I: After completion of Copying, double click on Roles folder under the opened project and verify that "Done" checkbox should be checked.