best pratics

best pratics

Hi, I have a table with

Rooms  - 1 +
Adults   - 1 +
Children -1+

when I click on Rooms + I need to add  Adults row and Children row. 

Is better if I add another table or add simply the row? Consider that when I click on Room -  if there are the rows about Adults and Children this row must be deleted

Hope I explain enough clear my problem.