Yes, you can create multiple records using Process Builder. When a process is created using Process builder while adding action there is an option in the dropdown of using apex, from there you can run your desired Class which can be used for the creation of bulk records.

Go to process builder, create a new process.

Add object -> select "Contact".
Start the process -> "When a record is created or edited"

Add Criteria
Set Criteria Name (to check for the new record)
Criteria for Executing Actions -> "Formula Evaluates to true"
Function -> Logical -> ISNEW()
Save

Immediate Action (if true)
Create record, select Fee__c -> assign values to all appropriate fields (either prefixed values or reference values from newly created contact record)

If the first condition is false

Add Another criteria ( to check if  Semester__c is changed or not)
Set Criteria Name (to check for updated field)
Criteria for Executing Actions -> "Formula Evaluates to true"
Function -> Logical -> ISCHANGED()
replace "field" with "Semester__c"
save

Immediate Action (if true)
Create record, select Fee__c -> assign values to all appropriate fields (either prefixed values of reference values from newly created contact record)


For further reference check this too,

https://www.sfdcpanther.com/create-update-records-using-process-builder-and-auto-launched-lightning-flow/

You can create and update multiple records using process builder
Here is the example:- 

https://www.packtpub.com/books/content/auto-updating-child-records-process-builder

you can add multiple things in the process builder using this example.
Hope this helps you.


Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Thanks.