You can enter and manage the availability of your resources in the tab Resource Management, subtab Availability (Resources).
Subtab Availability (Resources)
Enter and manage the availability of resources
Step 1. Navigate to the tab Resource Management, subtab Availability, and click 
to edit the availability.
Step 2. Enter the available hours per period per resource in the columns Availability (Ava):
•you can use the select boxes above the grid to only show the columns Available
•you can enter hours in individual cells
•you can use click-and-drag to select a range of fields; use shift-click-and-drag to select multiple ranges; on selections you can:
oQuick fill all fields in the selection with the same value: press q, or click the button Quick fill, or right-click the selection and select Quick Fill
oClear all entries in all fields in the selection: press x, or click the button Clear, or right-click the selection and select Clear.
Note: Click Help, then Shortcuts for an overview of shortcuts.
Step 3. Click Save to save the changes.
Enter and manage allocation on non-project activities (e.g. holidays)
Step 1. Navigate to the tab Resource Management, subtab Availability, and click to enter the edit mode.
Step 2. Click on the 
icon in front of a resource, a new row appears.
Step 3. In the new row, in the first column, select the appropriate activity
Step 4. Enter hours as described above, and click Save to save the changes.