Command entry:Tools menu 

 Viewport Canvas 

 Select an object. 

 Click a painting tool. 
 Assign a material or use an existing material. 

 Choose an empty map slot. 

 Create Texture dialog
            
  
            
Command entry:Viewport Canvas dialog 

 Options rollout 

 Click Paint On button. 

 Choose an empty map slot. 

 Create Texture dialog
            
  
          This dialog lets you specify the settings for a new bitmap for painting with Viewport Canvas tools. You can an existing bitmap
            for overwriting or let Viewport Canvas create a new one. 
         
          
            Interface
            
  - Width/Height
 
               - 
                  
 
                     Displays and sets the dimensions of the bitmap to create. Use these to set a custom size. 
                     
 
                   
                - Preset Sizes
 
               - 
                  
 
                     Click one of these buttons to set the Width and Height fields to the specified value. 
                     
 
                   
                - Color
 
               - 
                  
 
                     Displays the current background color for the new texture. To change the color, click the swatch and use the Color Selector
                        dialog that opens. 
                     
 
                   
                - Save New Texture To
 
               - 
                  
 
                     Enter a path and file name (with legitimate extension) for the new texture in the text field, or click the “...” button to
                        specify the path and file name using a file dialog. If you choose an existing file, the file is overwritten. 
                     
 
                     NotePressing Enter after entering a file path and name in this field has no effect; click OK to continue. 
                        
                       
                   
                - Show Map in Viewport
 
               - 
                  
 
                     Makes the map visible in the viewport. In most cases, leave this on so you can see what you’re painting. 
                     
 
                   
                - Map Channel
 
               -