On one hand, you really need to understand the basics of Access, SQL and how to work in databases. I couldn't possibly explain it all, but I can get you pointed in the right direction. Maybe you know someone who could help you set it up.
In Access you can link tables from other databases. But if the database is not on your computer, or in your local network you need to link it from a Datasource set up on your computer. You do that in the windows control panel called "Data Sources (ODBC)" found in administrative tools. You should add a new machine datasource of type SQL Server. Fill in the information about your SQL database.
Then in access you add a linked table, under type select ODBC data source. You pick the data source you created for your website db and then you will see a list of all the tables. Highlight all the ones you want linked into Access, such as Category, Product, ProductCategoryMap, etc. I would check the save password button as well. Then you have these tables you can work with inside of your Access DB. You can append new products from a local table to your remote database, do update queries, delete products or change their status.
Those are things you need to study about DB in general to complete, but they aren't that hard overall. Good luck.