We are research journal(scientific magazine which contains multiple articles and published with monthly issues and yearly our volume number changes) publication company.

We publish Scholarly Articles. Consider a scenario where our wordpress categories (parent child relationship) are made as follows:
-Journals (wordpress category, publisher organization)
–IJCST (wordpress category, periodical also means scientific journals)
—IJCST-C (wordpress category, part of periodical/magazine)
—-IJCST-C Volume 13. (wordpress category, volumes)
—–IJCST Volume 13 Issue C9 (wordpress category, issues)
——Scholarly Sample Articles (wordpress posts)

I considered above as:
IJCST-C will be a Periodical https://schema.org/Periodical
IJCST-C Volume 13 will be a https://schema.org/PublicationVolume
IJCST Volume 13 Issue C9 will be a https://schema.org/PublicationIssue
Scholarly Sample Articles will be https://schema.org/ScholarlyArticle

Now problem is that “IJCST-C”, “IJCST-C Volume 13”, “IJCST Volume 13 Issue C” all are categories.

SNIP is not allowing to apply different SNIP Schema Templates to these categories.

How can SNIP differentiate which category is volume, which one is issue (obviously there will be a loop of multiple issues in one volume and there will be multiple volumes in one periodical)?

Sorry if I am missing something.