is there any way to drawing polyline in back-end ?
1. create new Tour Page
2. in tab called Google Maps is form to puts geometric values of the new point on the map
3. in the same Google Maps tab is a button called "create another point" - generate new input type text (2x) (some JQuery, AJAX ?)
4. than i have for example 10 points
5. in front-end i genarate polyline on base these points
It's certainly possible - I'm doing something similar with polygons and OpenLayers.
This should get you started - it's an involved process, but is doable. Definitely have a look at the GIS module!
Of course, if you interested in paying someone to do it, I specialize in GIS services ;-D.
The GIS module doesn't contain any new page types. It contains the database fields, form fields, search filters and a few other bits and pieces that you need to start creating your own GIS-enabled objects.