Yes you could. But why? There are 60 in a bottle and unless you are checking 3 times a day, there is no point. I never checked more than once per day when I did, usually in the evenings.

Just be careful not to contaminate them when you cut them. That is, ensure you are using a CLEAN and DRY cutting device.

Notice too that the fore-urine is less concentrated with ketones than aft-urine. I usually wait until the end; also keeps the material from being washed off with excess urine. You'd be fine if you fill-and-dip though. Ensure the container is not contaminated.

Tom