Can you convert a stackable dryer 220 to a 110, and how?
No. A 220 V to 240 V clothes dryer cannot be modified to operate on 120 V only.

There are very small clothes dryers that operate on 110 V, but they are so small that it is clear that a standard 240 V clothes dryer requires much more power than could be supplied by a 120 V 20 A circuit. Magic Chef 2.6 Cu Ft clothes dryer