Pledge question

When setting up a stake pool, can you add pledge in pieces or do you need to pledge the full amount the first time you set it up?

For example: I will start with a 1000ADA pledge but next week I’ll add another 1000. Or do I need to put in the full 2000ADA the first time?

You can do it gradually. However, the configured pledge must never be lower than the combined owner’s stake. In other words, if you want to pledge a higher stake, you need to change the pool config (every time).