[sakshi kherodia]

To retrieve the list of objects, one needs to create a list of Entity :1. Create an empty list called the results list.2. Loop through the items in the Entity B list.3. For each item in the list, retrieve Entity A from the associated table.4. Add the results of the retrieve to the results list. Also if you are looking for an option to handle errors in Salesforce, do check this blog

[sakshi kherodia]

Though it is not possible, however, we can do this by replacing Salesforce's standard logo with a custom company logo by creating a custom app. First, you have to upload your logo to SF. You can choose a custom app logo from the document library. For more information check this tutorial. Also if you want to check the apps and tabs in Salesforce, read this detailed blog