I'm using the Waveshare High-Precision AD/DA Board, and they not use the default chip select pin of RPi (GPIO# 7, 8) for SPI.
Using the pigpio python library, I want to know how to change the chip select pin to an other GPIO pin.
You will need to set the selected chip select GPIO low before the SPI call and set it high afterwards. This will slow down the transfer. If it slows down too much you will need to find an alternative solution.