Autopulate repeating section on form

Hi 

I hope you are well. 

I am building a Nintex form using Nintex workflow cloud and pulling data from salesforce. There is a data lookup to pull the data Type as a list. The end user would select a Type from the drop down and then the items associated with the selected Type would be displayed on the repeating sections. There are varied numbers of items associated with each Type selected. My questions are 

1. How do I design the repeating section to be dynamic ie number of repeating sections should automatically change to the number of items associated with the Type selected?
2. If say Type A is selected and Type A has 5 items associated with it, I would like to have 5 repeating sections and each of the 5 items should automatically be populated on each row.  Please advise how to achieve this. Thank you