Hello Pranav,
First tell me why you want to increase Work center filled length ?
SAP already provide 8 Char length which sufficient, Please avoid the standard functionality changes
Standard SAP Field Length shouldn't be changed as per your requirement since the field can be used in some Reports, and it affects the Standard SAP Functionality.
Only possibilities to change the filed increase and decrease through Access key, for this contact to SAP or consult with your basis team
Its not good practice to change also by getting access Id.
If you need new one, just create a new field according to the requirement and make use of it.
Please refer below link for detail information
changing the sap standard field length ?
I hope this information helpful to you
Regards
Umesh Mali