In BikeCAD version 19, each dimension in the Dimensions dialog box includes a menu which you can use to apply a highlight colour to draw attention to a particular dimension. For now, colours 1 through 7 contain all the colours of the rainbow, but you can assign any colour you like as these highlight colours can be edited in the Paint dialog box.
Similarly, when adding tables to your BikeCAD drawing, each cell of the table now has a menu which can be used to assign a highlight colour to the associated cell.