Customization of WordPress Theme

I need someone to customize this theme about crowdfunding - [login to view URL] This theme is powered by WooCommerce. I need the ability for a campaign contributor to request for more than one quantity of a reward. For example. if someone is trying to fundraise a charity event and wanting to sell tickets as rewards, we want them to allow the supporters to purchase more than one ticket. So, they can buy 10 tickets (rewards) for $100 each for the event. You need to use the WooCommerce order quantity to customize this. It can be in a pop-up screen. So, when someone clicks on the "Select Reward" button on the theme (it's like a buy button), a small pop-up appears asking how many quantity. Then, it will redirect the user to the standard WooCommerce checkout page to calculate the price multiplied by the quantity. Please ensure it's mobile-friendly. Since each campaign has different rewards, the quantity selector should appear on the reward, like in [login to view URL] Some more info, -Please do it as a Child Theme. -We are setting up the development site for you. -We wish to have more than 1 of the same reward and more than 1 type of a reward at the same time. Just like in WooCommerce checkout experience where you could buy more than 1 quantities of a same thing and other things. -This featured is to be enabled for all campaigns.