\[- \left( 3x^{6}y^{2} \right)^{3} \cdot \left( - x^{2}y \right)^{4} =\]
\[= - 3^{3}x^{18}y^{6} \cdot ( - 1)^{4}x^{8}y^{4} =\]
\[= - 27x^{18 + 8}y^{6 + 4} =\]
\[= - 27x^{26}y^{10}.\]