Substrate structure and manufacturing process

A substrate structure, comprising:

• at least one detachable first substrate unit including a plurality of sidewalls and a plurality of first engagement portions, wherein at least one of the first engagement portion is disposed on the sidewall of the detachable first substrate unit;
• and
• a substrate body including a frame, a plurality of slot holes, a plurality of second substrate units, at least one opening and a plurality of second engagement portions, wherein the slot holes are disposed on the frame to define the second substrate unit, the opening is substantially defined by at least one sidewall of the second substrate unit and at least two sidewalls of the frame, the second engagement portions are disposed on the sidewalls of the frame, the detachable first substrate unit is disposed in the opening, and each of the second engagement portions is engaged with each of the first engagement portions.

22-27. (canceled)