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Hi Bobby AEA,
To change the existing data in a column, I would suggest you edit the list in grid view. The data cannot update automatically, we have to update it manually, and the easiest way would be editing in grid view.
Reference: Update information at the speed of type: Edit in grid view
If you have same information to be updated in all the fields, you can use drag to fill feature (just like Excel) to fill down the information.
- Click Edit in grid view
- Select one or more cells you want to use as a basis for filling additional cells.
- Rest your cursor in the lower-right corner so that it turns into a plus sign.
- Drag the fill handle down to the cells that you want to fill.
Besides, if you are okay to create a new column, then you can consider using a calculated column and use If function to apply a formula based on the existing columns.
Reference: IF function
Regards,
Neha