Bamboo re pot question.

Hi all,

I've a large pot containing bamboo. I don't know which varity but can check the weekend if really needed.

I've had it in the same pot for years and although I top it up with multipurpose in the summer its not looking as good as it should.

I thought maybe it could do with re potting and maybe splitting in to many pots as I could do with more. What I'd like to know is how to go about doing this and what soil is best to use? Also there are a few stumps of bamboo I've pruned back as they were dead. What should I do with these? Pull them out?

Thanks for any help.