Comparison of editing operations designs, before color reassignment: (1) Former "palette" design, (2) New single-row design -- SEE IMAGES BELOW:

1. ... with editing disabled
2. ... with editing enabled
3. New button labels, with respect to the type of selected items.

Also: new "Edit" menu (image to the right). The "Add Water Balance" operation is useful here because it won't be obvious to the user to deselect all items (by clicking within the table, but off of an actual item) in order to cause the "New" button to provide that operation.

Editing Disabled -- Former "palette" design:

Editing Disabled -- New single-row design:

Editing Enabled -- Former "palette" approach:

Editing Enabled -- New single-row approach: