Declension table of ?upāṃśvāyatana

Neuter	Singular	Dual	Plural
Nominative	upāṃśvāyatanam	upāṃśvāyatane	upāṃśvāyatanāni
Vocative	upāṃśvāyatana	upāṃśvāyatane	upāṃśvāyatanāni
Accusative	upāṃśvāyatanam	upāṃśvāyatane	upāṃśvāyatanāni
Instrumental	upāṃśvāyatanena	upāṃśvāyatanābhyām	upāṃśvāyatanaiḥ
Dative	upāṃśvāyatanāya	upāṃśvāyatanābhyām	upāṃśvāyatanebhyaḥ
Ablative	upāṃśvāyatanāt	upāṃśvāyatanābhyām	upāṃśvāyatanebhyaḥ
Genitive	upāṃśvāyatanasya	upāṃśvāyatanayoḥ	upāṃśvāyatanānām
Locative	upāṃśvāyatane	upāṃśvāyatanayoḥ	upāṃśvāyataneṣu

Compound upāṃśvāyatana -

Adverb -upāṃśvāyatanam -upāṃśvāyatanāt