Merged cells break imports: how do you restore structure before AI processing?
For misaligned imports from merged cells, identify merged ranges and stored values before assigning headings or group values to later rows. Unmerging or filling every blank can fabricate missing information.
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For misaligned imports from merged cells, identify merged ranges and stored values before assigning headings or group values to later rows. Unmerging or filling every blank can fabricate missing information. Preserve originals and restore explicit relationships on a copy before AI processing. Compare source coordinates; a tidier output does not establish correct meaning.
Identify merged ranges and their actual top-left values
This applies to departments spanning rows, multilevel headers spanning columns and only the first imported row having a value. Preserve merge ranges and layout and locate group headings versus data cells. Common spreadsheet files store a merged value only at the top left, so blank neighboring cells can be normal rather than lost data.
Separate inherited group headings from genuine blanks
Check exposed merge ranges, boundaries and storage positions. Separate vertical inheritance from multilevel horizontal headings and genuine unknown values. Unmerging does not automatically reconstruct business meaning. Define rules from the structure; visual proximity alone does not establish that records belong to the same department.
Restore field relationships on a copy before normalization
On a copy, convert hierarchical headers into explicit fields and attach group values only within confirmed ranges, preserving source coordinates. Leave genuine blanks unknown instead of blanket forward-filling. Create semantically complete records before extraction or classification and verify representative regions before scaling incorrect inheritance.
Map every result back to original rows and columns
Map results back to original cells across groups, blank rows and varying headers. Confirm group values stay inside actual ranges and amounts are not shifted or copied to the next group. Acceptance requires preserved meaning and traceability. Filled cells, equal column counts and AI claims of understanding do not establish accurate imports.
This article unmerged no private cells or modified originals and does not assume every spreadsheet stores merges identically. Complex reports may need human interpretation of headers and footnotes. Structural recovery differs from inventing missing facts. Mark ambiguity rather than hide it in a newly complete-looking table.
Checked sources
These sources support the concepts and methods described here. Examples and test scope are labeled separately; check the version of the tools you use.