Make a copy of your filtered portal--that way it has the same portal filter as the original.
Use portal set up to limit it to a single portal row.
Put your summary fields in this single row portal. You can format the portal so that the portal borders are invisible and what you then get will look like a single pair of fields displaying totals for the records that appear in your original portal.
Thanks, that worked (when I used the summary total that did not use running totals).
Do I need to keep the first portal or by just filtering by date it should keep the same information?
The first portal has no effect on the results shown in the new portal. You can keep it or remove it.