Wordpress ACF PRO plugin customizations

Hello! I need 3 pieces of code that will do some specific tasks for the plugin Advanced Custom Fields PRO TASK 1: I have a custom post type called "invoice", and I'm using ACF to create specific fields for that post type. I need a field number with Auto increment Value, it cant be repeated, it is for invoice unique number. It should always add +1 to the last number used. If I delete an invoice, should use the next +1 number. TASK 2: For the post type "invoice" I want to hide the WordPress default title field and use as the default name of that post a combination of fields. It should be the number of the invoice (previous field) + the value of another field of ACF called "invoice_po" TASK 3: For a post type called "po", I need to hide the default WordPress title field and name that post with a combination of ACF fields "po_operation" + "po_our_company" + "po_customer" TASK 4: I have a a ACF field OBJECT POST. If I select a post from this list, there are certain fields in the post that need to be autocompleted depending on the selected option. The information is obtained from this selected post, and I have a few fields that need to bring and show that information in the fields automatically. Budget: 30usd Code needs to be implemented in the custom plugin and well explained for each task separate.