Scale collaboration, not process. If you're trying to use agile and lean at the program level, you've heard of several approaches, all about scaling processes. If you duplicate what one team does for several teams, you get bloat, not delivery. Instead of scaling the process, scale everyone's collaboration. With autonomy, collaboration, and exploration, teams and program level people can decide how to apply agile and lean to their work.
"Must have for Agile transition!"
You'd like to estimate your project's cost or schedule accurately. So far, none of your approaches have worked. It's time to consider how you can create an accurate estimate. You might not be able to develop an estimate at the beginning of a project that is good until the end. Few project teams can. Instead, learn a number of ways to see your project and how to address your uncertainties in ways your managers will accept.