Outer[Append, mylist, mysecondlist, 1]
{{{a, b, 1}, {a, b, 2}}, {{c, d, 1}, {c, d, 2}}}
Also
Outer[Join, mylist, List /@ mysecondlist, 1]
{{{a, b, 1}, {a, b, 2}}, {{c, d, 1}, {c, d, 2}}}
kglr
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