Edwin, dimensioning is a simple thing. I'll post a dimensioned drawing
shortly.

As to your other question, I'm not certain what you mean. If parts are
drawn to the desired size, they will be in proper size relationship to
each other.

It is possible to draw components that can be later inserted into a
drawing. Maybe you have a standard hinge that you like to use on your
cabinets. You could draw the hinge and save it as a component. Then
draw the cabinet and insert and place the hinge component where you
want it.