Declension table of ?karmaṇya

Masculine	Singular	Dual	Plural
Nominative	karmaṇyaḥ	karmaṇyau	karmaṇyāḥ
Vocative	karmaṇya	karmaṇyau	karmaṇyāḥ
Accusative	karmaṇyam	karmaṇyau	karmaṇyān
Instrumental	karmaṇyena	karmaṇyābhyām	karmaṇyaiḥ
Dative	karmaṇyāya	karmaṇyābhyām	karmaṇyebhyaḥ
Ablative	karmaṇyāt	karmaṇyābhyām	karmaṇyebhyaḥ
Genitive	karmaṇyasya	karmaṇyayoḥ	karmaṇyānām
Locative	karmaṇye	karmaṇyayoḥ	karmaṇyeṣu

Compound karmaṇya -

Adverb -karmaṇyam -karmaṇyāt