Creating issue - condition for field

[Ali Azzam]

Hello all,

When we create a internal task, we do have to fill in information and choose data in fields. 

I would like to add a condition for a field, so it only shows up, if a specific data is chosen in field before. So let´s say we have a field where i have to chose one of following: 

A
B
C
D
E

Then I want a condition if "D" is chosen another field shows up witch should be mandatory to fill in. Then this additional field will have other opportunities to chose between. 
e.g 
1
2
3
4
5

See picture down below to understand situation. 
Looking forward for some advise. 

Best regards
Ali

[Valdis]

Is this you want to acheive?

https://confluence.atlassian.com/jirakb/how-to-display-a-field-based-on-another-field-s-selection-649921383.html

Have you looked in plugins?