How to create rule for DOCX From Dynamic Template

a!localVariables(
  local!application: rule!GAI_getApplication(applicationId: ri!appId).data,
  local!projectInfo: rule!GAI_getProjectInfoDisplaySummary(appId: ri!appId),
  local!grantDocument: rule!GAI_getGrantDocument(applicationId: ri!appId, isactive: true()).data,
  local!programAssessmentChart: rule!GAI_convertPgmActvtyAssmntDataToTempData(
    pgmActvtyAssmnt: rule!GAI_getPrgmActvtyAssessmentByApplnId(applicationId: ri!appId).data,
    applicationId: ri!appId
  ),
  local!programActivity: rule!GAI_getRefProgramActivity(
    programActivityId: a!forEach(
      items: local!programAssessmentChart.fk_program_activity_id,
      expression: fv!item
    )
  ).data,
  {
    local!grantDocument,
    local!programAssessmentChart,
    local!programActivity,
    local!application,
    local!projectInfo,
    concat(
    "<dynamic>",
    a!forEach(
    items: local!programActivity,
    expression: concat(
    "<ctable activity='",
    fv!item.['recordType!{c1b3acd6-4f4f-401f-828d-b60dc3af6722}GAI Ref Program Activity.fields.{c6132d99-98ea-42d1-a06a-2c005c045e8e}activityName'],
    "'activityName='",
    "' />"
    )
    ),
    "</dynamic>"
    )
  }
)

The easiest way to create a table in a PDF is to generate a table in HTML (see here: https://www.w3schools.com/html/html_tables.asp) using an expression rule and convert to PDF using the PDF from HTML using the Smart Service in this plugin: https://community.appian.com/b/appmarket/posts/dynamic-document-generator

If you want to generate a table in an already existing word document and then convert it to PDF, there is an example on how to create dynamic tables using this plugin in their documentation: https://community.appian.com/b/appmarket/posts/advanced-document-templating#

Note that there is often a loss of fidelity when converting from DOCX to PDF. If you're starting from scratch, I would recommend the 1st option (HTML -> PDF)