ComboBox item in list validation

Good morning, I'm trying every way on Postman to test validation.

I have a site that contains an Employee List page that contains name, cpf, and period. And on that same page I have a Period ComboBox with the items "Morning, Afternoon and Night".

In Postman I have a request only with the values ​​of the ComboBox and another request only with the listing of Employees.

Morning has code 1, afternoon 2 and night 3, how do I validate if it is filtering correctly, if this is returning an employee with the period related to the chosen item of the ComboBox Period?

I've searched a lot but I do not know how to tinker with two requests at the same time, I saw ways like sendNextRequest, create a global variable of an attribute in a request and use in the other request however I'm not understanding ...

In the Period ComboBox Request contains code and name, being vlCode and dsName. In the Listing Request contains name, cpf and period, being dsName, dsCpf, vlCodigoPeriodo.