I have almost 50 pages and they all have the same 3 column layout with small table on top.
...what I need is actually some inDesign magic and not setting it manually like I did it so far.
There really is no magic. Quality page layout takes work, and InDesign is only a set of tools. Fortunately, it includes tools to make the manual work you've done so far more easily repeatable than repeating the entire manual task.
- Set up and apply paragraph and character styles so the type formatting is consistent and easily adjusted throughout the document.
- Set up and apply object styles so object formatting is consistent and easily adjusted throughout the document
- (After you do the above) copy the whole page and Paste in Place on a Master page so everything in the layout is easily replicated on any/every page, then override items as necessary to edit each page.
I have already set paragraph and character styles but I am afraid I don't know how to set object style here - I haven't used them so far. This is the first long document I'm working with.
If you already know how to use Paragraph and Character styles, Object styles operate on the same fundamental principles. The same way you define, set, and apply type formatting via Paragraph and Character styles, you define, set, and apply the attributes of objects (frames) via Object styles.
If the Object styles panel isn't visible, call it up from the Window menu at Window > Styles > Object Styles. Choose New Object Style from the panel menu and explore the Object Style Options dialog. It's all there.