# Tuple support Tally's Custom Action builder supports the `tuple[]` type, called tuple arrays. ### What are tuple arrays? The `tuple`type in Soldity is a data structure that contains a fixed number of elements, each of which can be of a different type. For instance, a tuple can contain an integer, a string, and a boolean value all together. The `tuple[]`type, called a "tuple array", contains a list of tuples. ### Building a tuple array To create a proposal with a tuple array, add Custom Actions to your proposal. Then, use the imported ABI. Tally will infer the type from the ABI and help build the tuple array.

### Nested tuples If a tuple or tuple array is nested in *another* tuple, enter the nested tuple(s) in plaintext with brackets. This tuple builder contains two nested tuple arrays, `contactDetails`and `chains` , and one nested tuple `bountyTerms` :

To add tuple arrays and tuples, enter them in plaintext:

tuple builder with filled-in nested tuples

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