Cutting back can be one propagation technique that offers an opportunity to increase supply.
When cutting back your overwintered Fushias, save tip cuttings and re-pot will increase supply. I’ve done this with bedding Fushias to begin creating some neat standards. Or depending on variety, can be used for hanging baskets or pots.
Increase supply by 4-5″ Fushia cuttings that will root simply in a glass of water, kept out of direct sunlight. Pot up when you see roots forming.
When pinching out your snap dragon seedlings, same holds true. Simply re-pot the seedlings being pinched can increase supply.