Multiple Categories For the Same Post

Is there anyway i can use multiple categories in wordpress

I have two parent categories named level1a and level1b. Both these categories should have child categories namely level2a and level2b .

Now when i need to apply the level1a>level2a category and level1b>level2a category to the same post..
Is there any way to do this..

And when i goto http://blog.com/category/level1a - I need all the posts fomr its different subcategories to be displayed..

 

sure, you can do it but you can write the diffrent post to each categories too

 

how can i do it? you mean i have to make multiple posts.. thats not the way i want it..

 

If you just want to add the post to ALL of the categories, just check all the category boxes. Any post can be in as many categories as you want. If you don't specify one, it will go in the default category which is usually "uncategorized."

 

while creating the post select the multiple categories as you wish ...