Need someone very experienced in excel to create auto start and stop dates for inventory spreadsheet

business professional seeking someone who is very good in excel. Need inventory due and starts dates auto calculated in rows after manual entry in one cell. click below for a video description of the project

https://u.pcloud.link/publink/show?code=XZi1BgVZUzgKH4fLeAJgnx7BX0O69kSBcIwX

will accept all bids