You can't link in any direct way since you already created the tables.
Place the Excel file with the data you want.
You must have cells created for the incoming data in your existing table.There must be exactly the same number of cells copied and there are replaced by pasting.
In the new table select the cells you want in the existing table and copy them. In the existing table select the cells where they are going and paste.
Thanks for your quick response! I was hoping to avoid doing all the tables over again.