My guess is that you are using the HMX lite You need the HMX standard license to be able to customize the drawing template https://support.ptc.com/help/creo/creo_pma/r8.0/usascii/index.html#page/electrical_design/harness_mfg_extn/About_Harness_Mfg_Ex... View more

Here in Prime  using correct units (one of the very few advantages of Prime over real Mathcad)   EDIT: Yes, the definition of C1 at the top can be deleted as the solve block is parametrized. Furthermore, too retain full formatting capabilities in th... View more

You can remove them using "Remove" under the Editing section.  You will most likely need to check "Leave open" to get the desired result.