A blueprint is generally showing a 3D building in a one dimensional version. Therefore, seeing an upper cabinet or shelving location can be a bit hard to locate.
For a kitchen, the cabinet locations are drawn with just a simple solid line. You can usually tell they are cabinets because a) they are in the kitchen (or bathroom), and b) they show where the appliances will go.
For an upper cabinet though, the line is shown as a dashed line, usually 3/4 of the way up from the solid lower cabinet line.
Some shelving lines will also be represented by a dashed line. For example, a shelf above a washer & dryer. Or in a closet too.