All accounts come with a free builder license. This means initially you can only build one site with the builder. Additional licenses can be purchased so you can create more sites if you desire. They are available for $1/month per site, billable by the year, so $12 per year for each site.
You can purchase additional builder licenses via your AMP under the "Other" services.
I would need to know more about how you want to use the subdomains in order to give you a correct answer on the last question. How did you have the site envisioned?
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