Interpolation of 2 variable

Hello All,

I have 2 variables; one is pipe material and second one is temperature at 50/100°F increment.

By selecting Material data from drop down list and temperature. It will throw allowable stress value.

Is it possible to add interpolation formula if temperature value is other than what is available in the combo box.

For example, for P11 material at 825°F, allowable stress value is 14200psi by using interpolation method.