Standard MS Project Formulas

Is there any way of getting hold of the existing formulas in the default cells in MS Project?

I want to create a customised formula which for a a new column:

Start1 = "Finish1" Date of "Predecessor" + 1 day or "Project start date" if "Predecessor" is 0/valueless

Essentially this is the same as the default formula for column "Start" with reference to "Finish1" instead of "Finish".

So if i had access to the default column formulas im sure i could work out new formulas for my new columns.

Alternatively if these are not available, does anyone have a good list of basic formulas for MS Project or can anyone help with my specific query above.

Many thanks for your time.