If so, you need SAP Universal ID. In a few months, SAP Universal ID will be the only option to login to SAP Community. Without it, you will lose your content and badges. If you have multiple accounts, use the Consolidation Tool to merge your content.
Suppose i am doing selective deletion on a cube which is on BIA , then after roll up on that cube will data be deleted from BIA also and reindexing is done or we need to rebuild index .