When garlic is planted, it will be a single clove from the bulb. A bulb can have anywhere from 6 to 20 cloves. Those single cloves are planted in early November here, but you would probably plant yours early to mid-October. They will then over-winter. In late spring (mid-May to mid-June) I will harvest my garlic. You will perhaps harvest yours 2-4 weeks later than I. Those single cloves will have grown into bulbs. When you dig those bulbs up.............that's it. There will be no more garlic in the ground. It would do no good to leave any bulbs behind. They would probably just rot in the ground. After you harvest, you will simply store those bulbs. Then in the fall, you will repeat what you did the previous year, planting single cloves from your bulbs.
I hope this makes sense. If not, tell me, ask some questions, and I will do my best to clarify.