Tab Index sorting like Form Controls

[father]

Does anyone have any ideas on how Microsoft in Forms changes the order number with Tab Index?
I have a [Tasks To Do] table that I want the ability to quickly re-prioritize. Maybe features like add pick the order of a new Task and then reindex the others, or reindexing after deleting or completing a task?
PS If there is a book out there that discusses this, I would buy it.
Just generic answers would be good. It's fun to solve stuff myself.

 

[father]

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With a mixture of Before Updates, Before Delete, After Delete, For, next loops, unique ID's and Sorting numbers, I got it! It was fun. If you want it request it.