How to convert .dotx templates directly to .odc format.
Converting Microsoft Word Templates directly to OpenDocument Chart Files (.dotx to .odc conversion) is not possible.
Even though both .dotx and .odc formats are fairly common, it is simply not possible to use a MS Word template for creating an OpenOffice Calc spreadsheet.
In a word, direct dotx to odc conversion is not possible.
So don't expect any so-called dotx to odc converter or dotx to odc free online conversion tool available.