Estimated odo -- how do do this

[ciara_belle]

My brother borrowed the car and forgot to write down the ODO

it was last summer (yes i'm behind in entering receipts - tax time now i have to put them in haha)
There used to be a feature where it would estimate the odometer for me. I entered all the surrounding records. but cannot find the check box ... did it get removed or am i missing it ?

tia
ciara