Mobile Version Navigation Menu

Hi Blue Owl Creative, first off, awesome theme! Loving Aqua. My question is related to the navigation menu when viewing on a mobile phone. Our website has a lot of sub pages so our navigation structure is very complex so when viewing on a phone through the mobile menu the dropdown is HUGE! and very complicated. Is there a way to only show “selected” pages created for the mobile nav menu? Possibly within the menu setting of the theme there is a separate menu you can create just for mobile? Can this be done through the code or styling for the mobile version? Also if this can not be done by myself how much would you charge to do it? Thank you so much for such an awesome theme, excellent job and with this great support forum! Looking forward to hearing from you.