Progress bar and installation size

Good morning all
I have installer, where one section writes to database.
I want to reserve a space for it in installation page progress bar.

But this section uses no real disk space, as the database was already created before.

Is it possible in NSIS to tell a section use for example 25% of progress bar and no disk space?

I'm using MUI2.

Thank you in advance for answers!

You could try using SectionSetSize on that section after the directory page.

Stu