its own~やspecial~で表現できますね。
例えば、
Each A has its own B
Each A has a special B
各Aはそれ専用のBを備える
When you buy item A, you need a special application form for it
When item A is purchased, it needs its own application form
Aというものを買うときはそれ専用の申し込み用紙がいります
ご参考になれば幸いです!