define curve for lsdyna mat24

Hi,

I am going to define a stress-strain curve in the plastic range for mat24 in order to investigate a crashing tube under plastic deformation. The lsdyna manual indicates the curve id and table id can be used interchangeable, and in the actual curve card, there is nothing I can put in except input values after clicking the define table option. But in the array, it requests 'curveld' (looks like curve id) which I donot understand what I should choose here. This is also something I am confused about how the curve and table actually works to define some discretized points to calculate the deformation in the plastic range.

Please give some ideas how to understand the table and the curve and how to use them.

Many thanks.