In the Work > Administration > Work Flow Setup > Task Setup module, click the to expand the Task record to which you want to add Materials.
In the Material grid, click the Toolkit and select Add Multiple Materials. The following pop-up opens:
Open the Materials picklist. A list of items from the Work > Administration > Work Flow Setup > Material Setup module similar to the following appears:
Use CTRL + click to select the desired Materials.
Click Select.
Enter the Units field to indicate how much of the materials will be used to complete the task.
Click OK to save the record. The selected Materials now appear in the Task Setup record's Materials grid.
How to add multiple Materials to a Task Setup record
to expand the Task record to which you want to add Materials.
and select Add Multiple Materials. The following pop-up opens: 
