Bell curve cost projections with time and money variables

Hello to all,

While trying to find a way through excel for what I thought might be a template I was lucky enough to find this forum and a small spread sheet attached. My need is to show cost projections for construction projects based on linear, front loaded, end loaded and bell curve. The bell curve is most representitive of actual. I have attached the template I have found. My need is to be able to alter this to show a change in durations and costs distributed over the different methods of projection. This particular sheet would be perfect for a 12 month project as the data page is limited to that.

I will admit this forum is way over my head in expertise. Any help on this is greatly appreciated.

Wow, See that's golden. Rocket scientists, who knew? Thank you SHG for the link.