upgrading database - categories & product?

hi guys!
i have installed the 1.5.2 version.
my old store is built with 1.4.9.
i dont want to waste my time and add the product again.
how can i rebuild my categories and product? i want to have the pics too.
the 1.5.2 has 92 tables while 1.4.9 has 59 tables.

the problem is which tables of the old one should be replaced in new one?
and also does it have any incompatibility?
tank u

You can upgrade your v1.4.9 store to v1.5.2. Then remove the v1.5.2 database and use the upgraded database. That should work.

thank you for answer.
but i what do you mean by upgrade the strore?
i don't want to ruin my old version.
i will works for me but i am not going to add any more product in it.
i have got a new domain .install 1.5.22 version
i am going to have all the old product and add new product only in 1.5.2.2 version.
does your solution works?
if no what should i do?

then clone out the v1.4.x database and files, in localhost, upgrade to v1.5.2. then export database again, keep the tables you would like. That would do and not ruin any store