For change the custom color in rendering, First you need to change the finish in Custom Paint Option
Attention: the number and color for the Custom Paint Option is just for distinguishing the finish in file, doesn't means the exactly finish of the custom paint.
In Rendering section, select the Real-time light at the left side, and select Add to
Chose the light temple you like and press confirm
In Real-time light template, select the material at the left side
Clicks the panel you want to change to custom color
Select the Color at the right side, change the panel color the the custom color you want
Save the template for keeping the color change. You can find the change in the Real-time light template on the left side, and use the template for rendering
Attention: You can only change the color of one face in one time. For change the color of the door such as Solid Shaker door, you can only change the color face by face
In Design Studio, under Personal Library. Select Texture and upload the custom color you would like to use
In Rendering section, select the Real-time light at the left side, and select Add to
Chose the light temple you like and press confirm
In Real-time light template, select the material at the left side
Select mine, and you can see the custom color you uploaded
Drag the color to the panel, and the finish of the face would automatically changed
Save the template for keeping the color change. You can find the change in the Real-time light template on the left side, and use the template for rendering
Attention: You can only change the color of one face in one time. For change the color of the door such as Solid Shaker door, you can only change the color face by face.