Additional Ordering Option
The “Additional ordering option” field is a special function that can be used when ordering many compounds at a time. It lets you simultaneously add to the basket all the items from your search results in any specific amount (you have to set a minimum and a maximum acceptable amount).
For example, if you have 100 compounds that all need to be ordered in 50mg amounts, but you're willing to accept a minimum of 2mg if 50mg isn't available, you would put 2mg as the minimum and 50mg as the maximum, and then click the Add all to basket button. This would add to the basket all items from your search results that are available as 50mg. For those items that aren't available as 50mg, it would add the next available amount, all the way down to the minimum of 2mg.
By using this function, you would avoid having to individually checkmark each of the 100 compounds.
When ordering only a few compounds at a time, you can simply select the needed amount for each individual compound and click the Add to basket button (there's one next to each compound). This would add only the samples that you've actually manually checkmarked.