Store Calculated Field Value into Input Text Box

Summary:

We have Requirement where we need to display the calculated hours into the Input Text box.

If the total available hours is 100 and 50 hours is entered by Employee Number=1 and then if Employee Number=2 enters 30 hours and then still 20 hours remaining should be shown up as available hours in the Input Text box for the Next Employee Number= 3 to fill the hours.

Please advise .

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