Here is a list with numbers separated with a "-".
Problem: Remove "-" from list.

1. Select all numbers to be converted.
2. Go to "Home" tab.
3. Left click with mouse on Find & Select.
4. Select Replace (Ctrl + H)

   

5. Type "-" in "Find what:" box.
6. Type nothing in "Replace with:"

   

7. Click "Replace All".
8. The same list without "-".