This video demostrates basic workflows.

Select a category, then select a part in the category. Move mouse to canvas area. Click 'rotate current' button or use keyboard arrow keys to rotate position of the item to be placed. Left click to place the item.

Click 'stop placement' button or press 'ESC' key to exit place command. Two ways to move a placed item. (a) Left click on an item in canvas. The item will be selected and will display move adn rotate handles. Drag the handle to move or rotate the item. (b) Left click and drag an item. Then release left button to place it to new position.

Click 'stop placement' button or press 'ESC' key to exit place command. To select multiple items in canvas, click left button and drag a rectangle to select all items within the rectangle.

Select multiple items using Window Selection. 'Group' button will be enabled. Click the button. Selected items will be added into a group. The group of items can be selected as a whole, and be copied and pasted or assigned color.

Click 'stop placement' button or press 'ESC' key to exit place command. Select a single item by clicking or multiple items by window selection. Click 'Delete' button to delete selected items.

Select a single item by clicking or multiple items by window selection. Click 'color' button. Pick a new color for selected items.

Select a single item by clicking or multiple items by window selection. 'Copy' butto will be enabled. Click it to copy selected item into clipboard. 'Paste' button will be enabled. Click it to paste items in clipboard to current model.

By default, item is moved by one unit, and collision detection is enabled so that two items won't be overlapped in 3D space. The minimum snap setting can be changed by clicking 'Snap', then select a snap value. Collision detection can be disabled using the same command.