In transaction SE11, in the attribute tab of your z table check table maintenance check box. Go to SM30 transaction, enter the ztable name and click on maintain button.  Here you can enter new entries into the ztable .
Or
You can create a PARAMETER TRANSACTION for the transaction for SM30 . 
Follow these steps :
1. go to transaction SE93 , give your own transaction code say ztran_tab, for maintaining your ztable.
2. Click on create button and check the radio button Transaction with parameters (PARAMETER TRANSACTION) and click on the tick button.
3. In the next screen enter default values:
                        transaction : SM30
                        check the check box skip initial screen
4. Scroll down you will find a table control for default values
--------------------------------------------------------------------------------
        Name of the screen field      |       value
--------------------------------------------------------------------------------
    VIEWNAME                          |       your ztable name
    SHOW                                    |         X
Save your work.
Now as you have created a custom transaction for maintaining your ztable this transaction can be called from any program with CALL transaction 'XXX'.

 Serkan AKKAVAK
Computer Engineer
ABAP Developer & SAP MM SD Consultant
Contact : serkurumsal@yandex.com