l1 = {1, 2, 3}
l2 = {4, 5, 6}
l3 = {7, 8, 9}

{{1, 4, 7}, {2, 5, 8}, {3, 6, 9}}

Table[{i, j, k}, {i, l1}, {j, l2}, {k, l3}]
{{{{1, 4, 7}, {1, 4, 8}, {1, 4, 9}}, {{1, 5, 7}, {1, 5, 8}, {1, 5,
9}}, {{1, 6, 7}, {1, 6, 8}, {1, 6, 9}}}, {{{2, 4, 7}, {2, 4,
8}, {2, 4, 9}}, {{2, 5, 7}, {2, 5, 8}, {2, 5, 9}}, {{2, 6, 7}, {2,
 6, 8}, {2, 6, 9}}}, {{{3, 4, 7}, {3, 4, 8}, {3, 4, 9}}, {{3, 5,
7}, {3, 5, 8}, {3, 5, 9}}, {{3, 6, 7}, {3, 6, 8}, {3, 6, 9}}}}