With Microsoft Dynamics CRM Online there was a limit to the number of “workflows and dialogues” you can create of 200, along with entities of 300. You could find information about their usage in the Resources In Use page for your deployment (Administration/Settings/Resources in use) that looked like below:
In Microsoft Dynamics CRM Online 2015 Update 1 (Spring 15 Release 'Carina') this upper limit of “Workflows and Dialogs” has been removed.
If you notice in the below image the 3rd bar for it has been removed, for best practices of workflows please refer to: https://technet.microsoft.com/en-us/library/dn531079.aspx
With Microsoft Dynamics CRM Online there is a limit to the number of entities you can create. If you need more custom entities, contact Microsoft Dynamics CRM technical support. This upper limit can be adjusted, Ref: https://technet.microsoft.com/en-us/library/88b18946-474c-4c94-8e4c-27532f930757#BKMK_LimitationsOnMetadata