Sheets: How to add info to multiple rows in a column?

I have created a sheet with multiple columns and I want to know how I can select multiple rows in a specific column and copy and paste the info so that I don’t have to enter the info individually on each line?

For example, lets say one column is called Date Added. How do I select a number of specific rows in that column and add the same date for those selected rows?

Edit: OK, one way I worked out how to do it is to save as a TSV file and reopen in a spreadsheet program and in that program you can select multiple rows and save after editing and reopen in DTP again.

That is not possible at this time.