Dear Xiaokun Hu,
The sliders you mention are one possibility to serve your need. Humans cannot see or percept more than three dimension, hence the 3D plot is a projection from higher-D to 3D. With help of the sliders, you can set values for the axes which you do not see in the 3D plot. You can also select one design and click "Use current design values" to move the values "into" this design.
Another option is the "Approximation design table" which you find in the list of Visuals (typically bottom right field of the application). Here you can exactly specify, import or sample values. Then select lines and use the pulldown button at bottom right of the window the get the metamodel results.
Regards,
Veit
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You are navigating away from the AIS Discovery experience