Declension table of ?kopayitavya

Neuter	Singular	Dual	Plural
Nominative	kopayitavyam	kopayitavye	kopayitavyāni
Vocative	kopayitavya	kopayitavye	kopayitavyāni
Accusative	kopayitavyam	kopayitavye	kopayitavyāni
Instrumental	kopayitavyena	kopayitavyābhyām	kopayitavyaiḥ
Dative	kopayitavyāya	kopayitavyābhyām	kopayitavyebhyaḥ
Ablative	kopayitavyāt	kopayitavyābhyām	kopayitavyebhyaḥ
Genitive	kopayitavyasya	kopayitavyayoḥ	kopayitavyānām
Locative	kopayitavye	kopayitavyayoḥ	kopayitavyeṣu

Compound kopayitavya -

Adverb -kopayitavyam -kopayitavyāt