Surveyor Estimating App for IOS/Android

Description

I am a surveyor that needs an app built for my own estimating purposes to include:
We require a new feature on an existing flutter app.
Estimating Feature -
Create create rooms, set dimensions and description Add imagesAbility to Add, Remove & Rename RoomsAbility to Clone Room (This will clone the room and all items inside of it)Room Templates - Ability to Create and Edit Room templates. The templates hold a list of line items
Query API database for the "Master Line Item List". Add line items into the rooms. Line items includes:QuantityDescriptionItem PriceTotal ( Item price * Quantity)Line items can have order changed App needs to be optimised for Mobile Phones & Tablets as it will be used by Front Line workers. App needs to maintain a working offline state since the user maybe in locations with poor signal. This means the Line items need to be cached and have local save state before syncing with the database. Must have context menu