Hi Treasure,
1) There is a setting in PO company profile and the 'runtime variables 1' screen for 'Decimal places in unit price'. Do you have 2 here or a different value? This affects entry.
As for specifications, you need to edit the specification and change the 'display format' from 2 decimals to 3. Depending on whether you use extended specs or not will determine where you need to make this change - extended specs require the change on the 'sub-report' tab.
2) If you mean widening the unit of measure on the printed form, then you need to edit the specification(s) that print this information and widen the field object.
If you mean widen the size of the field on the entry screen, that is something you cannot change, though it appears wide enough to fit many characters.
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Regards,
Softrak Tech Support