Declension table of ?kṛtvya

Masculine	Singular	Dual	Plural
Nominative	kṛtvyaḥ	kṛtvyau	kṛtvyāḥ
Vocative	kṛtvya	kṛtvyau	kṛtvyāḥ
Accusative	kṛtvyam	kṛtvyau	kṛtvyān
Instrumental	kṛtvyena	kṛtvyābhyām	kṛtvyaiḥ kṛtvyebhiḥ
Dative	kṛtvyāya	kṛtvyābhyām	kṛtvyebhyaḥ
Ablative	kṛtvyāt	kṛtvyābhyām	kṛtvyebhyaḥ
Genitive	kṛtvyasya	kṛtvyayoḥ	kṛtvyānām
Locative	kṛtvye	kṛtvyayoḥ	kṛtvyeṣu

Compound kṛtvya -

Adverb -kṛtvyam -kṛtvyāt