Open Photoshop. From the Windows tab select Swatches
View the dropdown menu on the Swatches palette by clicking on the arrow pointing down on the top-right corner of the palette window. Select Load Swatches from the dropdown menu.
Select your Color Table (.aco) then click on the Load button.
Colors from you Color Table will be add into the current Swatches.
Now, new colors are ready to be used in your drawing.