The ORM supports multiple scoring options for a class. It generate the outputs for all of these scoring options (Overall Results in Info, PDF Overall Results, PDF Start Lists, PDF Result Lists, ...).
You can define a new scoring options on Admin > Classes > Class > Scoring simply by clicking plus-sign button.
Then you can define the name and options you want to use.
For race pickup you need to choose races you want to use. First, select option to use selected races only and then choose race you want to use.
The overall results for this scoring option will be calculated just like regatta with these selected races only. You will be able to see it on the Results page by choosing scoring option next to the class selector (scoring option selector is visible only if there is more then default scoring settings). As you can see on the image below there are only R1, R2 that we chose.