Xtraction has a connector for use with CA Service Desk. Once you have purchased the connector integration is simply a matter of adding it to your data model and configuring the connection string. Of course it may be necessary to modify your data model with any customizations you have done, such as new fields or tables.
There is a step by step to such integration , or there is documentation to do so ?
Are you asking how to embed the Xtraction interface into the CA Service Desk web interface, or are you asking how to enable Xtraction to report against CA Service Desk data?
If you are asking how to modify the CA Service Desk Manager web interface to include Xtraction as a separate tab, those instructions are available here: Xtraction Tab in CA Service Desk Interface (R12+).
If you are asking how to configure Xtraction to report against CA Service Desk Manager, that should have been configured as you were installing/configuring Xtraction. If it was not completed, or completely incorrectly, I would recommend that you open a support ticket with CA, since you originally purchased Xtraction through CA and support the product for you.
I hope this helps.