Sadly, NX out of the box Library is built utilising old and outdated feature creation methods. So first you must learn how they survived in the stone age. Because of this you need lot of research and efforts to edit your library and it’s frustrating to work with a scattered outdated system.
I don’t know if NX has any plans to streamline and modernise their OOTB library. For instance, Hole Callouts don’t work well with those old False Bodies; until they come out with the new Hole system.
Mold Wizard uses component first workflow, you add a component, the pocket body is in a "FALSE" reference set which dimensions are also controlled by spreadsheet. This will create associate position/size of component with pockets.
You can open the spreadsheet by "Edit Data Base" to customize the pocket dimension of MISUMI, for example "f_T_clr" etc.
Clearance value is different for each company, that's why 0 is used for MISUMI, user needs to change it according your company settings.