A level - deciding between Econs and business , graphic communication and textiles

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You don't need any qualifications to become an entrepreneur or go into business.

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You don't need any qualifications to become an interior designer (at least not in the UK, but I'm pretty confident that applies internationally as well)

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You will need RIBA accredited degrees to become an architect (at least in the UK, but you might need to check whether you need to convert your degrees for other countries to work there as an architect as well).

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In terms of A Levels required for degrees in business, interior design, and architecture, they generally don't require any specific subjects i.e. you can apply for degrees in these subjects with A Levels in any subjects usually. There would be a few exceptions where you might need A Level Maths for finance and economic degrees, and you might be asked for Art and Design for some degrees in interior design and architecture.

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Whilst you do not need qualifications to start your own business, the theory in A Level Business Studies can often suffice if you want to start a small business (the knowledge of which should be similar if not identical to what they teach you in a standard business degree e.g. BSc, MBA, MSc, etc.)

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You can often find the same material and knowledge in A Level Business Studies in standard courses outside of college (and hence also outside of uni).

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Economics and business studies are generally considered very similar subjects (they're technically not) for university application to degrees that ask for well rounded candidates e.g. management degrees. If you want to be considered for all possible degrees and you really want to do economics/business studies, then pick one of them only. Otherwise, look at the entry requirements of the specific degrees that you want to study to see what they specifically require and whether they are exceptions to the rule.