Add node : These buttons add a new BOM node, respectively root, normal or inverse. Click here for their meaning.

Undo Button : This button will undo the last action done. There are multiple level of undos. If you leave the arrow pointer on the button, a hint containing the next undo message will pop up.

Delete Button : This button will delete the selected node(s).

Cut Button : This button will cut the selected node(s). You can paste them into the same project or into another one.

Copy Button : This button will copy the selected node(s). You can paste them into the same project or into another one.

Paste Button : This button will paste the node(s) currently in the clipboard, if any.

Check Button : This button recomputes the whole BOM graph, updating final percentages of all nodes and displaying any applicable error or warning messages at each concerned node of the graph.

Help button : This button calls up the online help on the BOM graph.