SQL Server stored procedure , loop through table and get values?

Question

In the code shown below, I loop through a table (in this case the disciplines table) and want to add records to another table, I'm rather new to this

How can I retrieve values from those tables for the insert command?

CREATE PROCEDURE cdisc 
    -- check disciplines
AS
BEGIN
    DECLARE test CURSOR FAST_FORWARD FOR
        SELECT * 
        FROM tbl_portfolio 
        WHERE show = 'Ja' ;

    WHILE @@FETCH_STATUS = 0
    BEGIN
        DECLARE disc CURSOR FAST_FORWARD FOR 
            SELECT * 
            FROM disciplines;

        WHILE @@fetch_status = 0
        BEGIN
            INSERT INTO ProjectDisciplines (Proj_id, discipline_ID) 
            VALUES (disc!ID, test!id)
        END 

        CLOSE disc
        DEALLOCATE disc
    END

    CLOSE test
    DEALLOCATE test
END