Greetings.
Yes you can do that, at the top of our website, click on My Account, sign in if needed, then at https://account.microcenter.com/members/account.aspx, click on "Add an Order" and enter the reference number from the top of your purchase receipt.
Submit photos and a description of your PC to our build showcase
See other custom PC builds and get some ideas for what can be done
Services starting at $149.99