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There are two ways on how to set Source to multiple rows. 

From the Row Options screen

1. Select row/s.
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2. Click on Options button. The Row Options screen will be opened. In the Source field select Units then click Ok.
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3. You will be back to the Row Designer screen. Now selected rows will have Units in the Source field.
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From the grid 

Say you want to set these rows to have Units in the Source field. To do this follow the steps below.
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1. Select row/s. Hold Ctrl key while clicking on the Source dropdown button of the first selected row.
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2. Select Column. Immediately the selected row/s will be updated with Column in the Source field.
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