Hi!
You need to pass the three exams in order to get HCIP R&S-certified. If you feel confident to take the three exams on the same day, then it is possible. Here you will find more information about each topic;
https://e.huawei.com/en/talent/#/cert/product-details?certifiedProductId=175&authenticationLevel=CTYPE_CARE_HCIP&technicalField=IIC&version=2.5.