The availability function allows you or the employees themselves to set them as available for certain time periods.
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You can mark people as available for the days when they are able to work - the available days will be displayed on the Schedule Calendar in a light green colour.
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To add an availability simply right-click on a person's row and choose 'Mark as available'. Next, a dialogue window will open where you can enter either a single period availability or you can also select multiple days.

Once the availability has been created you can drag and drop shifts onto it as usual.