A map book is a collection of pages created with Data Driven Pages in ArcMap and printed or exported in various formats, such as PDF. It is not possible to convert a map book to a map series in ArcGIS Pro. However, the Data Driven Pages used to create the map book can be exported to ArcGIS Pro to create map series. To do this, follow the steps provided below:
The map series can be exported to other formats such as PDF and JPEG. Refer to Export options for more information on exporting map series in ArcGIS Pro.