Views can’t be merged, but they can be duplicated then changed.
But it sounds like you’re really just trying to wrap your head around what a view is. If all the data in your Airtable base is in a house, views are windows into that house. In other words, they don’t contain any of the data, they’re just showing you a slice of it. When you add a filter, group some rows together, hide columns etc. you’re changing what data the view is showing you. But you’re not altering the data itself. At any time, you could unhide all the columns, ungroup everying, delete all the filters - and then you’d have a view that shows you all of your data. Here’s Airtable’s explanation of what a view is.
I generally use a handful of views for each table. They’re usually task oriented - one for adding or editing data, another for reading through it, etc. That way I can toggle between them depending on what portion of the data I need to see for that task.
