Firstly, would like to know where to find the documentation related to NLS support. During the training, it knows that it has a different languages for a same form in different portal. For this assumption, in case of a form is created in English portal site. Is it avalable to search in Chinese portal of that created form??
NLS is referred to as Localization in the Avoka products. You can see items related to Composer form localization here: Library Advanced Features
Localization of t-field details are here: Other Languages
Localization of portals is done on a per client basis. You should check with your tech lead on this. Rather a form appears in multiple places is a configuration decision, which again would be specific to your portal implementation.