I want to write a module in which you can upload an excel file, after uploading some of the sale order records should be updated based on excel file content. How can I achieve this using odoo import excel option?
Create a custom model tailored to the excel file you want to upload, so you can upload it just using the standard odoo import function. Then you can write a method to be called from a menu action or a button that will process the imported lines and flag them as done or delete them.
Otherwise you have to make a model where you can upload the excel file as a binary attachment, and then elaborate it manually using a python excel library.