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Original estimate does not work that way. It's not actually a discrete field on its own, it is part of a set of system functions that look like several fields. The "time tracking" "Field" consists of original estimate, time spent, and remaining estimate, (and a series of others for displaying more about sub-tasks, and some other stuff).
The original estimate is not intended to be changed. It's expected to be literally your first estimate. If you later discover it is wrong, or just needs refining, you're expected to alter it by adjusting the remaining time, not the original.
So that sort of answers your "other field" - you can use "remaining estimate" to add to the original (for example, if you put in an original estimate of 5 hours, then you log 2 hours work to it and realise it's going to take an extra hour, change the remaining estimate from 3 hours to 4 hours!)
This keeps your original estimate intact, and enables you to easily see when people are increasing (or decreasing) estimates as they go, helping you improve your estimation process. (For me for example, when I first started using time-tracking in Jira, my team lead was quickly able to see that I was under-estimating small tasks all the time, while over-estimating the larger ones)
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