Yes. Use + Add above the table in Prod. codes. Then you can add several lines and save them all at once.
How to do it
Go to Prod. codes.
Click + Add at the left above the table, next to Edit and the search field.
Fill in number, name and budget (may be called Cost price estimate) on the new line.
Add more lines in the same way.
Save when you are done. All the lines are saved at once.
Good to know
If you only need to add one code, you can also use + Production code at the top right.
The budget can be 0 and filled in later.
If you are going to enter the whole chart of accounts or many codes, import from Excel is often the fastest.