In Control Studio, click the down arrow in the list box at the top of the palette and select IO. This makes the I/O function blocks available to you.
Drag the Analog Input function block from the palette to the diagram pane to create a generic AI block. The handles around the AI block indicate that it is selected.
At this point, you may want to rename the AI block to make it meaningful to you. Right-click the block and select Rename.