I am looking to hire someone from overseas to work on collecting data for my new start up company. I would like to provide them with my data in excel format, and have them fill in the blank areas that I do not have completed. However I would not like for them to have the data I have already found. **** Question: What would you recommend to do to keep my data safe from sight? **** Here is an example of the data: 1st Column: Account Number 2nd Column: Account Name 3rd Column: Account Phone Number 4th Column: Account Website 5th Column: Account Address I have the Account Number, and Account Name for all accounts. However some are missing a phone number, others an address, and about 75% are missing the website. I would like to keep the data that I have private, possibly invisible, and if a cell is missing data it is highlighted to make it easier for those working with it to spot an empty cell.