Hard to say without knowing what you are trying to do.
That is, yes there are multiple SPI hardware CS pins on the Teensy 3.2...
That is the following pins can be Hardware chip select pins: 10, 2, 9, 6, 20, 23, 21, 22, 15
But in the majority of libraries it does not mater and you can use any digital IO pin for the CS pin. As most libraries simply do pinMode/digitalWrite to set/clear the CS pin...
However the T3.x board SPI hardware has the ability to encode how to change SPI hardware pins as part of their hardware registers, which can really speed things up. This includes libraries like: ili9341_t3 library.
There are some complications of using these hardware pins as they actually get encoded as a mask as part of the PUSHR instruction and some of these pins map to the same bit, so your program can only use one of them as hardware CS pin... The groupings are (10, 2), (9, 6), (20, 23), (21, 22), 15
The other way that hardware CS pin are used/needed is if you are trying to run SPI as a slave device. In which case you need to use a hardware CS pin and if I remember correctly it must be of the first grouping (10, 2).