Categorising My Users

Hi there

I want to organise my external users / customers like in the list below. Please note that some of the main categories have sub categories. Is this possible to do in Zoho, so that for example I can mail out just to VC Blogs list?

Many thanks

alex

1 - Founder / Start-up:

2 - Promotion Targets:

- Tech Blogs

- VC Blogs

- Business News Sites (Top Tier)

- Business News Sites (Low Tier)

- Business Networks

- App Reviews & Directories

3 - B2B Targets:

- Accelerators

- Incubators & Biz Education

- Deal Matching & Brokers

- Crowdfunders

- VC Firms

- Angel Investors

4 - Suppliers:

- PR, Press & Journalists

- Sponsors

5 - Other: