WSProxy-batch-update-regular-DEs-to-sendable-same-structure.html

<script runat="server">  
Platform.Load("core","1.1.5");  
try{
  
var prox = new Script.Util.WSProxy(); 
var CustomerKey = []; //Create an array withh DE External Keys
var IsSendable = "true",
    SendableDataExtensionField = {"Name": "email", "DataType": "EmailAddress"}, //Provide the name of the field used to establish a data relationship (SendableDataExtensionField relates to subscribers on SendableSubscriberField)
    SendableSubscriberField = {"Name": "Subscriber Key"}; //Use "Subscriber Key" or "Email Address" depending on whether the SUBSCRIBER_KEY business rule has been turned on.

for(var i=0; i< CustomerKey.length; i++) {
  var res = prox.updateItem("DataExtension", {"CustomerKey":CustomerKey[i], "IsSendable":IsSendable, "SendableDataExtensionField":SendableDataExtensionField, "SendableSubscriberField":SendableSubscriberField});
  Write(Stringify(res) + "<br>");
} 
  
}catch(e){
Write(Stringify(e));
}
</script>