Thank you for your interest in my Room Booking Pro plugin!
At the moment this plugin targets B&B’s and small hotels with unique rooms only.
I have just finished a series of updates for one of my other paid plugins (CRM Pro) and am about to start work on a series of improvements and new features for my Room Booking Pro plugin.
There are some issues that have priority for me and some new plans to restructure the plugin and introduce new features. One of those features is the ability to offer rooms in quantities.
So in terms of your timing for a project requiring room quantities, you are a little early :)
I see 3 options:
wait for me to introduce this feature at sometime in the coming months (probably as a separate plugin that extends my Room Booking Pro plugin)
extend my existing Room Booking Pro plugin yourself to offer this feature to your client (you could optionally replace the quantity function in your plugin with the new functionality in mine at a later time if you want to transfer the responsibility of maintenance and development of this feature back to me)
do something else now and join the party later :)
In any scenario I am here to assist you. Do let me know how I can help!