Dear Queriest,
If it is a conversion of Private Limited Company in to LLP, then the entity of your company remains the same. In this case you need to inform all the registering / licensing authorities, from whom you have obtained any registration, license, code, NOC etc., about this change with fresh certificate of incorporation issued to you.
With certain authorities you need to submit this change in prescribed form & format, like EPFO : Form 5A, ESIC : Form 01.