IRA 72t withdrawal?

[teejayevans]

Probably a simple questions, but haven't found the answers anywhere.
What is the definition of an IRA, ie
If I have an IRA with split between 2 funds, is that 1 IRA or 2 (as
far as 72t purposes). And if its 1, and I make withdrawals, can I
specify which fund the 72t deduction comes out of? Lastly, what
do I have to do (if anything) to tell mutual fund company this is
a 72t? I assume they will withheld the 10% penalty if I don't tell
them it's a 72t withdrawal.
TIA
TJ