Dynamic values in a Drop down inside a repeating section


I'm using Classic forms and in the form there are five single line text controls (called From  Style 1 - From Style 5)where the user fills one or more boxes depending on the requirement. 

From Style fields.JPG


In the same form further down , I have repeating section and inside that I have choice a control(configured as a drop down ). I need to populate this drop down from the values the user enters in the five single line text boxes above. 

From Style repeating.JPG

I believe I have to use Javascript for this but I'm not familiar with it. Appreciate if someone could help  to achieve this.





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