The available cash limit is the amount that can be cashed so far.
If you withdraw 1000 yuan, the available cash amount and the available cash amount will decrease at the same time.
For example, the credit line is 8000, the available line is 5000, and the available cash line is 4000. At this point, you withdraw 1000 yuan in cash. Then the credit line is still 8000, the available line becomes 4000 and the available cash line is 3000.