The Scenario
You're a SaaS marketer setting up a new Laposta list for an upcoming B2B campaign. The product team handed you a spreadsheet with 8 custom fields: field name, datatype, required flag, and default value. You need every one of them created on the new list before you start importing leads.
Clicking through Laposta's custom field UI to add eight fields individually — picking the type from a dropdown, setting the required toggle, entering a default — takes about 20 minutes and leaves room for typos on every screen.
The bad version:
- Open the Laposta list settings, click Add Custom Field for the first entry
- Select the datatype from the dropdown, type the name, toggle required, enter the default, save
- Repeat seven more times, trying not to fat-finger "text" as "numeric" on field six
- Discover after importing your first batch that you set field four to required but your import sheet doesn't always populate it
You already did the thinking when you built the spreadsheet. Clicking through the same information eight times in a form UI is not a good use of a Tuesday afternoon.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent inside your Google Sheet. It reads the field definition table you already built and creates each custom field on your Laposta list via the API, in order, with the right type and required flag on the first pass.
Read the field definitions in Sheet1 — columns: field name, datatype, required (yes/no), default value — and create each one as a custom field on Laposta list B2B-Leads
What You Get
- All 8 custom fields created on the B2B-Leads list in the order they appear in Sheet1
- Field types set correctly — text, numeric, date, or select_single — as specified in column B
- Required flag applied for any row where column C is yes
- Default value set where column D is populated
- The SheetXAI sidebar confirms each field name as it's created, with the Laposta field ID written to column E
What If the Data Is Not Quite Ready
Some datatype values in your sheet are informal labels that need mapping
Read Sheet1 field definitions and create each as a Laposta custom field on list B2B-Leads — treat short text as text, number as numeric, date as date, dropdown as select_single; column C for required, column D for default value
You want to create fields on two lists at once
Read field definitions from Sheet1 and create all fields on both Laposta list B2B-Leads and Laposta list Enterprise-Prospects — report back whether each creation succeeded on both lists
Your sheet has extra rows that are notes or headers you want skipped
Skip any row in Sheet1 where column A is blank or starts with a hash, then create the remaining rows as custom fields on Laposta list B2B-Leads using column B for type, column C for required, column D for default
Validate, create, and write confirmation in one shot
In Sheet1, flag any row where column B is not one of text/numeric/date/select_single by writing ERROR in column E, then create all valid rows as custom fields on Laposta list B2B-Leads, writing the new field ID to column F on success
The spreadsheet you already built becomes the authoritative source of truth, not a reference you're transcribing by hand.
Try It
Get the 7-day free trial of SheetXAI and open the field definition sheet you've been maintaining, then ask it to scaffold your Laposta list schema from the table. You can follow up by asking it to import your first subscriber batch against the newly created fields.