Update ref-other-sources-hubs.md

articles/hubs/ref-other-sources-hubs.md

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+# Reference Other Sources
+Hubs allows you to reference other sources to automatically populate your Hub with content. We call this “powering” a building block. You can power a building block with a file from the current file, a file from the current project, a file from another project, or a file from an external source. 
+
+### What can I Power
+
+- Pages 
+- Subpages 
+- Text Blocks 
+
+## How
+
+### Power a Subpage 
+
+1. Select the Hub you wish to modify 
+2. Select (or create a new) Subpage 
+3. Click on the gear icon in the center of the editor toolbar (If new, this window automatically opens)  
+    1. Select Power this Subpage with an External Data Source
+    2. Select the data source from the drop-down menu 
+    3. Input the specific data source or select from the drop-down menu
+    4. Input an inner data source (optional)  
+4. Click Confirm  
+
+
+
+ 
+
+<callout> Try it Out! Power a Subpage with an API Spec from the same project </>