Customise a Shopify template

Hi I need a Shopify developer to adjust the 'Brooklyn' Template. My current problem is that this template only shows each collection of products on different pages. For example, 'collection 1' will show on page 'collection 1' and 'collection 2' will show on page 'collection 2' I need all my collections to show together on one page, seperated by the collection titles. For example: ********************************** "Collection 1" [product a] [product b] [product c] "Collection 2" [product d] [product e] [product f] "Collection 3" [product g] [product h] [product i] ********************************** The products need to be displayed in the 'grid' style - not the 'collage' style. Obviously the page needs to be dynamic in the sense that if I change a product in 'Collection 1', this is updated on this new page. If you have read this brief in full and think you can help please type "Zap" in the first sentence of your proposal. Thank you!