VOC budget process in this credit

Yes, you can use the budget method for this credit as well as 4.1.

Hmm, the FAQ information noted below has guidance that is a bit different:

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One flooring adhesive we are using falls under both IEQc4.1 and IEQc4.3, and is over the VOC limit. We are using the VOC budget method to meet IEQc4.1 requirements, but are we automatically disqualifed from IEQc4.3?

Technically speaking, the IEQc4.3 credit language would not allow you to earn the credit in this situation. The budget method is not referenced in IEQc4.3. However, there has not been an official ruling on this from USGBC, and a case could be made through a narrative or a LEED Interpretation for earning the credit.

Any updates on this?  Has the VOC budget method been officially approved for this credit?  If the budget method were used.  Would it have to be from flooring products in the same category?  For example, could a flooring adhesive that is over this VOC limit be offset by any flooring product that is under the limit, or only another adhesive (or IEQc4.1 flooring product)?

see this webpg on LEEDuser that indicates leed budget aloowed under EQc4.1 is not available for use on EQc4.3 (v2.2)

See: https://leeduser.buildinggreen.com/content/voc-budget-method-described-e...

My experience tells me that is also the case for v2009. 

Agreed, I've never heard of the budget method being used on this credit. Not to say it couldn't with a LEED Interpretation.