Add Filter option for inbound delivery items in VL60C

Hello All,

In tcode VL60C we don't have the option to search for a post by a criteria like searching for items wich begin with number "1" ,I want to add filter option as a button , i found the screen where i can add the button include /SPE/INB_GR / screen 1110 after i all attach a function which contains the logic ,
I found the class 'LCL_FILTER' in /SPE/INB_GR / , i ask if i can use this class in my case?

can u help me to implement the logic ?

Thanks in advance,