A cool capability was recently added to the EPM SaaS Cloud applications, letting a user neatly navigate across modules for integrated business flows.
Once administrators set up the connections, users who have access across EPM Cloud subscriptions can navigate across them from a single access point with one login. Also, artefacts such as forms, dashboards, and so on, from across subscriptions can be co-mingled within a cluster or within tabs on a card in navigation flows. Artefacts in the target subscription are accessible based on the user's role.
Ways you can connect to other EPM Cloud subscriptions include:
John Goodwin has written a good explanation of EPM Connect on his blog.