Hi,
In order to retrieve values from Excel Sheet which is in your Google Account to RMP,you need to use Google Spreadsheet Connectors available in RMP basically : Login Spreadsheet, Get the id of a spreadsheet [V 3.0], Get the id of a worksheet [V 3.0] and Get all rows [v3] .Using these 4 Connectors in your process activity,you will get all the values from spreadsheet in the computed parameters of your process.After getting the values,you can store it in a collection using freemarker code and then set it in a text box in your WI from collection.
There is also another way.You can download your spreadsheet in CSV format on RMP using 2 Connectors: Login Spreadsheet and Download a spreadsheet to RMP [v3] . In this case, you need to use ${import_objects("file id", "collection name", ",", "true")} to store in collection. File id would be the id of the file generated in RMP after it gets downloaded.
The description of the above mentioned connectors are very well given in the connectors itself.It would help you to find out what exactly the input parameters you should put in the process activities while using those connectors.
Hope it helps.
Thanks & Regards
Bidisha