My question is about Ability for an author to reorder...

[bunny008]

I want to know how to provide the numbering for each tab, so that author can provide the number to the tab as per their requirement/preference/relevance.Requirement

[Jaideep_Brar]

Have you looked into using the "sling:orderBefore (String)" proeprty and update it dynamically using Sling Models?

sling:orderBefore (String)

Contains the name of the sibling node that the current node should be positioned in front of."

More details at [1]

[1] https://helpx.adobe.com/experience-manager/6-3/sites/developing/using/sling-resource-merger.html

[Nirmal_Jose · Accepted solution]

As per the screenshot the number of tabs are fixed, so you can have another tab - order selector - where you can configure the order. 

Btw, I would prefer this to be done as a container and subcomponent structure instead of a blobbed up dialog.