Pass UI information between tabs

How do I pay information between a tab widget on a main view form? I have a main view class that has a tab widget, I need to pass fields form line edits form setup tab to my addline tab. For example I have a ui->SetupTabField->text(), and would like to use this in the AddLineItem tab. Thanks for any help, new to QT and C++;

Code:

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MainView::MainView(QWidget *parent, SetupTab& setup, AddLineItem& addlineitem) :
    QMainWindow(parent),
    m_setupTab (setup),
    m_addlineitem(addlineitem),
    ui(new Ui::MainView)
{
        ui->setupUi(this);
        m_setupTab.setParent(this);
        // auto setup_tab = new SetupTab(this);    // Create instance of the class
        ui->loSetupTab->addWidget(&m_setupTab);
       // auto addlineitem_tab = new AddLineItem(this);
        ui->loAddSmallParts->addWidget(&addlineitem);
}
 
void MainView::createActions()
{
 
}
 
MainView::~MainView()
{
    delete ui;
}

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Code:

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#include <QIcon>
#include <QtNetwork>
#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QUrl>
#include <QUrlQuery>
 
static auto RESOURCE_PREFIX = QStringLiteral(":/xml");
static QString FILEERROR_MSG = QStringLiteral("ERROR OPENING FILE");
 
SetupTab::SetupTab(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::SetupTab)
{
    qDebug() << "QWidget SetupTab has been envoked!";
    ui->setupUi(this);
    //Start: PO generation (fjd 8.5.16 1:46PM)
    QString po = "";
    Utils *u;
    u->createPO(po);
    ui->leShipToDealer_PO->setText(po);
    //End: PO generation
    //AddLineItem* m_newLineItem = new AddLineItem(this);
    //m_newLineItem->changeUI();
    ReadBaseXMLFile();
}

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Code:

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AddLineItem::AddLineItem(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::AddLineItem)
{
    ui->setupUi(this);
}
 
AddLineItem::~AddLineItem()
{
    delete ui;
}

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