How to enable Quantity field optionally while entering timecard?

Summary:

Hello,

We have a requirement,  for Non-Exempt employees, only the Start/Stop time is required on the Layout Set. However, in some cases, they simply enter the Quantity and are paid based on the number of hours entered. Which means, they should not see Quantity field in general course, but whenever required employee can optionally enter only quantity on time card.

Is there a way to handle this in a single layout set?

Regards,

Mansi Rajendra

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