Hi,
1- *DIM-ension a TABLE (see help) to have 100 rows and 2 columns, format your data points file as needed by ANSYS (see help) and then read-in the data from file into the table. Let's say your table is named "DATA_PT", and that the first column contains the total strain whether the second column contains the stress.
2- Use non-linear kinematic hardening material model, as follows (indicatively):
TB,KINH
TBTEMP,...
*DO,i,1,100,1
TBPT,DEFI,DATA_PT(i,1),DATA_PT(i,2)
*ENDDO
You can write these commands in a text file and then "Read Input From..." this file. This APDL file may also include the table declaration (*DIM,...) and the data reading from file (*TREAD,...).
Regards