Assign single varible a multiple rows using Select query in stored procedure

Question

My query is to assign single varible a multiple rows using Select
query in stored procedure
For example:
I get 10(say 1 to 10) employee ids from from Employee table
declare @id int

select @id =EmpId from Employee

select @id

This will return 10 rows(i.e.Employee id , suppose there are 10 rows in a
table) now my question is how i will get this all rows in a single variable
and use that employee id one by one to perform some calculation.