How to Sum a total of certain rows but leave the other rows blank

How do I create a column that sums the total of each row based on the invoice #, but leave the other rows blank. So it doesn’t repeat itself?

| Column 1 | Column 2 | Column 3 | Column 4 |
| Inv1     | $10      | $45      |          |
| Inv1     | $15      |          |          |
| Inv1     | $20      |          |          |
| Inv4     | $2       | $9       |          |
| Inv4     | $3       |          |          |
| Inv4     | $4       |          |          |