How to add multiple Logos?

How to add different logo for different client profiles ?

Are you referring to the top left corner logo above the menus? If so, changing that logo is a White Labeling in Grafana Enterprise:

However it’s not possible with the current feature set to do it per dashboard.

If you only have one Grafana instance you’re using for multiple client dashboards and no active Enterprise license, one thing you could do is to use the Text panel on each client Dashboard in HTML mode to drop in the client logo on the Dashboard itself:

Thank You.

Got this using text panel and html tags